I believe you can fins many interesting G-Shock's there and daily several are listed. I myself have bought a few over there. If you can't find what you are looking for in all those adds, use the search feature.
If you sell a G-Shock BTW, please mention the name G-Shock in the title. Note that some sellers only mention the sub-name, like Raysman, Frogman or recently G-Cool (man. I had to search for a while to find it again...)