If you live in the area, target on Michigan ave in Canton is selling core sets for $20, the target in Southgate has em for $12 apparently but that's too far for me. Picked up two sets for $44 not tooshabby imo. Good luck there was about ten left on an end cap when I went.

I picked up 1 at the Target on Warren in Westland for 20.00 also, looks like the post holiday sale.

Neither of those places are that close to me, but I should check the Target's that are close in case it's a regional thing.