I have several spare sets for sale or will trade. I do not have these listed in my for trade items as of yet. I do have some left over doubles from these sets available in my trade items though.
2011 Topps Garbage Pail Kids Flashback 3 2 full sets and 2 sets missing a few cards
2012 Topps GPK BNS 4 sets and 1 partial missing a few cards
2012 Topps GPK BNS Adam Through Time insert set Have 2
2012 Topps GPK BNS Adam Through Time insert set Green parallel 1 set
1986 Topps GPK Series 3 set missing 3 cards not all variations included
2017 Topps GPK Battle of the Bands 5 sets