Neo,
I won't be driving up to Tampa this weekend like I thought. Sorry.
Call House of Hobbies in Tampa, Florida.
They've been in business since 1962 and have an impressive collection of models and die cast cars.
727-943-5800
Ask them about 1/12 scale robot models in their sci-fi/Gundam shelf. They might not know they're there but I saw them last month. If one of those models says GMP, you're in luck! I think they wanted between $15 and $25.
For price bargaining...They've been sitting on their shelf since at least 1992 when I visited their store in Clearwater. The models moved to their New Port Richey store and now are in their new Palm Harbor store. I think they have a few Zentradi ship models, too.