I tried the $1 preorder with Borderlands 2 (Vita - $31.99) and it came up $17.99 automatically. Later, I went to another Target to try it with Kirby Triple Deluxe (3DS - $34.99) and it came up $20.99 automatically. I think that means it's
not YMMV and obviously a glitch.
UPDATE: Apparently the deal is the game must have been $39.99 MSRP at some point, which is why Borderlands 2 stacked sales no problem. I thought Kirby Triple Deluxe was always $34.99 MSRP but it worked fine for me, I don't think the cashier override anything but sounds like its YMMV.
After reading some of the replys, it looks like your best bet is to PM other stores. AFTER the price adjustment, toss in a $1 preorder to get the $15 off. I suggest doing that after because some employees will refuse to give you a deal after a price match and they have every right too. Just act casual
Sabrages' Spreadsheet (PM him to contribute)