We went to a Super Target a little further away from us this weekend, and I actually did see a Thanos and Ghost Rider on the pegs (for the first time). I didn't really have the funds to pick them up, but I'll be checking back there eventually to see if they are there (or if there is a restock). About every other store in our area has had virtually the same stuff for this line for quite awhile now.
This is one line (much like DCUC) where it almost pays to just order online. I don't know if this is a nationwide thing or not, but Marvel Universe stuff has always been very hit or miss locally. When the line first hit, certain figures from that first wave(s) clogged the pegs for awhile. Then they stayed that way for quite some time before you'd find another wave for a bit. Usually a wave or two seems to get skipped, and then you might find something.