Vanilla Visa Refund + multiple payment source @ Microcenter?

Yes, Micro Center does do multiple payment type transactions. Just tell them how much for each card, then swipe it (just don't go back and add something because the charges will be pending).

Depending on the store, you shouldn't even need to charge a credit card to reserve stuff. What is general practice is you call the store and tell them to reserve something for you. The main operator will call an associate from that department, and they will make a quotation and hold it for you at will call.

At that point, you will have 24 hours to come and pay for your items before they are put back on the shelf. If you can't make it within 24 hours, tell the associate to get a manager to sign the quotation and say not to purge until COB on a set date. They are usually pretty accomodating.