Good luck with that, and if you do find some, get the cheque book out.
Most boxes will sell privatly to a select handfull of people.
Some sets it's impossible to just find a single wrapper.
Just some examples over the past few years on ebay.
Close Encounters of the Third Kind, box of 60 packs, went for $250, in 2008 (Very Very common packs)
Popswaps, box of 36 packs, went for $195, in 2005 (Very Common Packs)
Nice and Nasty Love Notes, Box of 36 packs, went for $920, in 2007 (Uncommon Pack)
Just to give you some idea because i'm a Scanlens non sport collector as well.