I know people have talked about it on here before, but the Jackson is crazy. Just for the fun of it I was watching one last night on eBay. VG condition and it went for $140!!! That could buy you a low VG 1956 Mantle (which I'd rather have any day of the week)
http://www.ebay.com/itm/1966-Topps-B...vip=true&rt=nc
I think the key thing on these sets is patience. There are always more out there and every once in awhile you can get lucky or find a good deal. You just have to know it when you see it.