We ended up using airauctioneer.com it was great. It was $100 to setup an online auction with >3 baskets. Then we opted to take payment with Givebutter. I included the payment instructions in the congratulations email for auction winners. Then I went into give butter and pre-added the baskets as a “ticket type” then had Customer Success change it from a ticket to a item/product. And set the price as $100 and kept them inactive. As soon as the auction closed. I went into each basket. Corrected the amount from $100 to whatever the final bid price was and then made that product active. Then I made sure to add the “value” in the title of the basket name. And in the thank you note that’s generated after someone pays I made sure to call out that the tax deductible amount is the value subtracted from the final bid price. Ideally it would be nice to have a field that allows you to enter the value and then auto calculates how much of the amount paid is tax deductible. Unfortunately because the Givebutter receipt doesn’t include the product description I had to add the value to the title of the basket but would've been nice if the description could be optionally added. There was only a 20min or so delay from the time the auction closed until I was able to manually enter the final bid price and make the items active with a max quantity of 1 to be purchased. This worked very seamlessly to be honest. Our auction coordinator was able to go into Givebutter and confirm who had paid and who had not and who had opted to write a check to know to collect that before handing over the basket. I really loved using Airauctioneer and being able to use Givebutter to collect payments allowed us not to have another platform collecting donor data and also avoid transaction fees.

I hope your team does a gap analysis using Airauctioneer because I think their setup is very well done and felt the UI was very straight forward to set up our online auction the night before the event.