No sure if anyone else has tried this, but Citi Easy Deals found me a good price.

Easy Deals is a program for Citi card holders where you earn dollars to apply as discounts. I have found the points to not be that useful, but they do offer Budget and Avis rental cars.

For a one way rental I am doing between CAK and CLE, Easy Deals came out about $5.00 cheaper than Costco (though $5.00 more than the Costco prepaid rate). This was the lowest price I found.

When I looked at my reservation I saw a new BCD code. I am hesitant to share it because I don't know what rules apply with it, but the code did not appear anywhere on Google when I searched for it.

I wonder if the way Easy Deals works is that by using the points you get to use the BCD code. There appears to be no requirement that a Citi Card actually be used for the car when picking it up.