welcome as a poster!!

I know of no portals yet for Amazon but you could check your favorite airline malls to see what is comparable and go from there. I'd then get that airline's credit card and watch the miles pile up! I just racked in a ton from various NWA promos and CC deals coupled with mall activity. Also did well on AA but United's mall has always had mile posting issues in my experience, so be sure to save everything related to any charge no matter what you do.

Now, I personally have had bad experiences with Amazon and here are some things to watch out for just in case--this may help you think about the shopping you do:

1) do not store info like a debit or credit card number on your account. In one case, a coupon that should have worked was NOT applied but no real notice was given to the purchaser. This, in turn, did charge a debit card listed in the account that actually was expired and had an old address on it. Purchaser had no idea. It was supposed to come from the coupon but it instead 'sucked' the info right from the existing member account area and took money that should never have been spent. In the end, the bank account got Overdraft fees and charges and it took 3+ months to fix it all trying to deal with Amazon and Mastercard, etc.

2) CS is a huge department with no onsite managers. If you need to escalate any issue (like the above), you are mostly out of luck. You will have to google HQ and battle with them hard, and good luck with that! They know they are a big, successful company so they will try and beat you.

3) Some Amazon items are 3rd party (meaning many coupons will not apply but their fine print can be confusing and deceiving as hell) so it's a pain to deal with these if there are any issues, etc.

4) often times, if you think about it, you could do better on Ebay in most cases for most stuff you need online. Still, no miles with ebay, but that's my experience.

Anyway, I may be biased but even so, if there are no miles involved it's a lean toward the places where there are. Unless the $$ savings is really big or the item is available nowhere else, I would consider weighing the cost of the Amazon listed items against those at other stores found in airline malls.

Add that with promos that may be going on and see if the gain of miles thru such portals is worth any difference in price for your needs. For example, if I am a Staples Reward member, and NWA mall has a 4 mile/$1 spent portal, and a NWA promo is giving 500 miles for every mall purchase over $50, and the items ship free if over $50, AND I get my credit card miles too and the item comes from Staples itself in 2 days, PLUS is has a store rebate too, then it was farrrr better to go with them than something competitive in Amazon or in other places. Also, right now, Home Depot has free shipping on select items over $49 too, for example. You just have to look around to find these sorts of combinations, I think.

Good luck and enjoy!

MM