Somewhat new to collecting... Where?

I am somewhat new to collecting. In the past year or so I started buying the Jakks WWE Classic Superstars. But I pretty much only went to TRU and occasionally Target. Didn't really look much further than that. With the release of the Mattel products, I am finding myself somewhat obsessed with finding everything. So my question is, WHAT STORES can you find Mattel product in? Which ones do you frequent?

This thread stems from just reading that someone found figures at Walgreens. Had no idea to look there. haha.

Stores I am aware of for new product:

Toys R Us
Wal-Mart
KMart
Target

Found older figures at:

Big Lots
TJ Maxx

THANKS!