aaaaaaahhhh, This is a tough request! Most of us who bought them for 3-4USD each just bought enough until we got at least one of each if we wanted an entire collection. Some of us just wanted a few of the 24, and not the entire set.
The best way to get all 12 of each of the two sets may be to buy what you can find at a TRU or other toystore trying to get different sets by touch or luck (if you have a local store.) Then you could try to buy the others off PFers, who probably would not charge the high prices on eBay for known figures.
Most of us seem to have the amount we need for customizing other figures, and don't want to part with our "extra" parts yet. We are waiting for the next set (no. 2) to arrive so we have more options for customization. Good luck, Pgal