If popular enough, sometimes sets do make a come back. There were two CCnG IIRC.
Or sometimes people redo the GB with a slight variation in colour.
Also sometimes sets are available from vendors. Techkeys, for example, "sponsor" some group buys, and make extra sets available for retail sale (at a slightly higher price).
KeyPop do this too.
But in the short term, the best bet is Classifieds.