Wanted: Common 2600 Carts

I need to replenish my supply of common 2600 carts for recycling into homebrew games.  If you have a fair number of duplicate 2600 carts in your collection that are just sitting around collecting dust (or taking valuable space!), you can send them to me and I'll give you store credit in the AtariAge Store.  I also need 5200 and 7800 cartridges, so if you have extras of those, I'll gladly take them as well.  

* For 2600 carts, I need first-party cartridges produced by Atari, white Coleco carts (such as Donkey Kong), and SEGA cartridges with the ridges at the top of the cartridge.
* I'm not looking for silver-label carts at this time, but all others are fine (text, picture, red, and gray label carts).
* Cartridges need to be free of physical damage, have no permanent etchings or markings on the plastic, and be clean and stain-free (stains are tough to remove).  The condition of the label is unimportant, since it will be removed. Games do not need to work since I'm removing the boards.
* I'll give 50 cents in store credit for first-party 2600 Atari carts, $1 for 2600 Coleco carts, $1 for 5200 and 7800 carts, and $3 for SEGA carts.  I will also cover the shipping costs.
* To keep costs down (shipping is expensive), I'm looking for a minimum of 20 carts at a time.

Please send me a PM if you can help.

Thanks!

..Al