The Springwood Toyworld have the 5-pack and 2-pack Power Core Combiners, but looks like just one case of each, so after I bought 3 of the 2-packs, there were only 3 left.

They also had about five of the MP Skywarps. Don't recall the price, but don't think it was too bad. They look very nice in that packaging - almost makes me want one (already have the JP version, which I don't think is different enough to get a second).