Jump over to their site for the rest of the information. You can get the set of 4 for only $40 plus shipping! I have been waiting almost 20 years to get my hands on versions of these characters - and now it is completely possible.
The OSM are completely compatible with Glyos, meaning there are infinite combinations possible using the pieces.
Also, make sure to stop by and see the Horsemen at the New York Comic Con next week!