I was just sent a link to the Sludge Demons I made for Mandarake. This is the ONLY way I know of getting them so if your interested here ya go !
Secret release go >> HERE <<
Regular release go >> HERE <<
Looks like they are charging only 5,000 yen per figure which is exactly what I wanted them to charge with the current exchange rate and all. So hopefully the price wont be to bad, esp. if you grab both ;)