Late response...but it looks like even though the page remains, that it indeed no longer works (I tried my first responder discount just now). id.me DOES offer a cashback portal for Hotels.com - which is currently 2%. May not sound like much, but it could be more than the other portals you use regularly (Topcashback, HooplaDoopla, & Rakuten for me). For posterity or in case it reactivates, the landing page is here - https://www.hotels.com/page/idme-validation/ and on the other side, here - https://shop.id.me/stores/240-hotels-com

Other discounts include -

Target - At one point you could get like 10% off by going through a link in your RedCard account with the downside that you didn't earn reward night credit - then it died. There was another 10% off offer until earlier this year and the page is still up, but it's obviously expired. https://www.hotels.com/page/target/

Students - This page is still active with current dates, I am not a student though to test it (edit other locations online suggest it's 10%, unclear if you still get stamps) - https://www.hotels.com/page/student-discount/

Rebate For Longer Stays - This one runs frequently and gets refreshed not too long after the dates run out typically. Almost always the same format. You can maximize this by breaking up the stay if you hit some odd break points usually. Usually starts at 3 night stays (like $20 rebate) and maxes at 12 nights ($100 rebate). Find it here currently (the url can change every so often I've found if it's showing as expired, so google "hotels.com rebate" in that case) - https://www.hotels.com/page/rebate/

Double/Extra Stamps - This runs every so often and simply gives you extra stamps. It sometimes has property exclusions. Basically you either get double stamps or a bonus stamp on a stay. Sometimes has minimum stay lengths and maximum stamps (ie double on first 5 nights only). Can usually work around by breaking up the stay to maximize these if you want. There was one running last weekend. It often requires you to book on their app instead of the website.

General % discounts - They used to run these more regularly until about 2018. They have been much rarer since. There have been some targeted ones (a 10% off for Mastercard holders in 2020 for example). They ran one in Jan of this year. The format was a special promo code for 5% off. Despite the name of the URL, it appeared like it worked fine for everyone and gave stamps. Link here for posterity - https://www.hotels.com/page/january-coupon-non-member/ with terms - https://www.hotels.com/booking/coupo...onName=RWD5122

They may have some other stuff from time to time - nothing really code-wise for Black Friday this year, just an up to 30% off "sale" on certain hotels.

Note - Almost all of these promos run for a period of time (book by X date) and travel period limitations (travel between X and Y dates or travel by Z date). Some of them have limits to how many discounts they will give out total (examples - 16k for the Jan discount and 55k for the $100 rebate).

Other Discounts - Hotels.com gift cards can be a great deal. Sometimes various merchants will offer a deal like - get a $500 Hotels.com gift card for $460 (actual deal from BF this year) for example. Other times, it may be helpful to remember that you can buy these at grocery stores typically (amongst other places), and this means you can take advantage of things like 1) fuel point earnings and 2) grocery store credit card cash back/points. Doctorofcredit is a site that I usually see these listed at (also a good site to check regularly I might add). Next, you can use a credit card to purchase rooms at hotels.com that gives rewards or cash back (or that is running a promo in that area). Some examples of categories that may work include - internet purchases and travel (specifically look for things like "online travel agencies" when drilling down into exactly what that means). The credit/debit areas of the FT forums may be able to help you here. Lastly, the Hotels.com credit card (issued by Wells Fargo) is basically a 2.2% cash back everywhere card with some pretty high redemption limits ($500 to get a stamp, 10 stamps to cash in) with a couple of not-bad perks (Silver status at Hotels.com, cell phone insurance, car rental insurance (secondary in US), and some travel protections hard to find nowadays that may be worthwhile). So it's sort of a mixed bag - basically if you don't mind Wells Fargo and the *high* redemption options vs other cards, it's a pretty decent no AF card option for everywhere spending.

Price Guarantee - They have a price guarantee for their own site and for outside sites. There are a few limits, but all in all it's pretty decent. This isn't an outright price discount, but it falls in the same realm IMO. It's more restrictive on non-refundable rates, but still not too bad IMO. Details here - https://www.hotels.com/customer_care...guarantee.html