I have a dark holographic prerelease team rocket garydos card my cousin gave me when I was a lad. I'm considering selling it but am unsure of its exact value. Could anyone give me an idea?

Looks like it might be worth .99cents.

Pokecorner - (http://pokemon.gamingetc.com/products/search?query=gyrados&store.x=26&store.y=9)

Well that's legitametly disappointing... One would think that it would be worth more with all of that stuff in front of the name...

Well that's what you get for a Promo card. The big words PRERELEASE on top give it away. These are worthless as they were never included in actual sets.