We have had several reports of this and now that Canada has joined in, it seems like a big chunk of North American Walmarts have rolled back their prices for several Transformers items.
In the US, it seems it is mainly with the Robots in Disguise line with reports of Warrior class toys being found for $9 USD.
Canada has had a more sweeping rollback with the movie toys being reduced to better reflect their prices in the US market. So
leaders going from $69.97 to $54.86 ($42.74 USD),
voyagers going from $39.99 to $29.86 ($23.26 USD), and
deluxes going from $29.99 to $22.86 ($17.81 USD).
The most Combiner Wars Boxsets have lowered to $109.97 CAD while the exclusive
Platinum Autobots set has decreased by $50, making it $149.97 CAD.
Finally, the deluxes and voyagers from Titans Return have lowered to $14.92 and $22.97 CAD respectively.
We must remember that all these prices being lowered coincide with each of these lines ending and thus will most probably not reflect what the prices of the upcoming new lines will be.