Best place to find a retired Stampin' Up set?

There are ISO and For Sale Stampin'Up Facebook groups. Some are for "Retired" products only, other allow people to sell any used products. It might be worth checking those out.

It was just released in the mini-catalog that goes along with Sale-a-bration. Products in that catalog are officially only available from January to end of May, but sometimes they carry items over to the new annual catalog in June. That bee set was one that my demonstrator was surprised to not being carried over (same with some of the manly sets in past years that are more versatile than ones they do carry over). Apparently they didn't expect it to be so popular--there was some matching paper that was a free gift that sold out early on, it was the only free gift that I was interested in. Since it didn't carry over I would guess some demonstrators might be looking to sell their set, but it still might be hard to find because so many people liked it.

Even though the moderators can sometimes be difficult or obnoxious, if I were looking for a specific Stampin Up set, I would try the Buy, Sell or Trade forums at SplitCoast Stampers. Since it started out as a Stampin Up message board, they still have the best selection of that brand I have found on the internet. They do have an "ISO - In Search of" section where you can request a specific set, but I do think you have to actually be a member to see the ISO forum. You might find it already listed for sale in the Sell forum though.