Mostly I buy "loose" fabric cuts but I have many kits, as well. When I first saw this topic, I thought it said "Do you buy quilts?" which I've also done ONCE.
I bought a 4" patch block quilt top for $40 from a local antique store. It's just the quilt top but I'm going to tie it with the backing of muslin, like they did in the "olden days".