Has any body else heard of the Gravis joysticks for NES. I haven't seen any on EBAY, or on the web where I've searched. I have 3 of them boxed, but I wasn't sure of there value or rarity. They are fully licensed too. The box says that they were made in Burnaby, B.C., Canada, and I live in Vancouver so I was just wondering if they were only released around here or if anyone else has heard of them.

Any info appreciated. Thanks