Don't know if any1 else mentioned it yet in this thread, but I think it helps when pricematching at Walmart to go directly to Customer Service to do it. This way your not really rushing the cashier when there's other people waiting behind you to cash out. It worked for me a few times anyway.
EDIT - I'm actually going to try it again @ Walmart with the TR Broadside I bought a couple weeks ago tomorrow.
I'm also going to try & price-adjust my TR Topspin @ TRU. Wish me luck. LoL
EDIT - Success @ both TRU & Walmart. Got back about $21 for the two figures. Sweet.