03Mach1 of 2005 reports finding a display of Energon Combiners in the center aisle of his local Wal-Mart. This is one of those "pallet" style displays, similar to the one which featured Megatron earlier this year. He reports that there were approximately 24 of each torso, and a dozen or so each limb of all currently released (A1, A2, A5, C1, C2, C5) figures. There were also locations for each unreleased figure, with a label of "Coming Soon...".
Hopefully this should help with those having difficulty finding the figures!
