I manged to talk to Diamond Select a bit about their Ghostbusters the video game Minimates, and it turns out they’re not gone! Fans will be able to get them, in a limited supply, at the San Diego Comic Con, with the rest shipping to specialty stores. The sets will retail for $16.
Time to start bugging your local comic shop!
[UPDATE] The first series of Minimats have landing in comic shops, where you will also be able to buy the Amazon Minimates ghosts after SDCC, and Eric has the proof.