Price matching, as this thread demonstrates, is a filthy tangled difficult mess - just the way retailers like it. It's a way for retailers to *feel* like they're offering something good while only rarely having to actually follow through.
I cut through the mess with either no-receipt exchanges, or a repurchase-and-switcheroo.
Target are quite happy to do the former. I bought Prowl and Lockdown at the K-Mart sale for about $20 each, since they had no Wave 2 Deluxes. I took them to my nearest Target and asked if I could exchange them, apologising for having no receipt. There was no complaint at all; I went down and got my Ratchet and Blackarachnia, and they kept my Prowl and Lockdown. I filled in a little slip with my name and address, and I'm home free.
The latter is a more complex where you actually have to purchase all the toys, then return the ones you don't want to the store with the highest priced receipt.
I know some people might consider this a bit ethically dodgy, but it saves massive hassle, and no-one is actually getting ripped off, since they are undifferentiated products (i.e. the TFs sold by KMart are the same as the ones sold by Target), and everybody ends up withe either the same number of toys or payment for those toys.
SofaMan - Occasionally Battling Evil with his Mighty Powers of Indolence