WTB Contra protos & PROBOTECTOR PROTOS

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I'm looking to buy pre-release versions of Contra games. Can be betas, samples, previews, review copies, etc. I WILL PAY MINIMUM $50 FOR REVIEW DISCS/CARTS AND MINIMUM $100 FOR BETAS.

Here are some that I'm aware of, but these don't have to be the only ones:

-Probotector II NTSC version for NES; looks like this https://contrapedia.files.wordpress....9/sdf987u3.jpg

-Contra III prototype, sold on the French website leboncoin https://contrapedia.files.wordpress....4084920453.jpg

-Contra III beta for SNES. Has "Not For Resale" on it, but it's NOT the same as the "Not For resale" carts usually seen. This one is like a lab loaner; plain white label with black print; back has "Return" instructions, with address and comment.

But other than Nintendo, could be for other systems, too. Here are others I've seen online:

-Probotector beta for Genesis (used in magazines/review)

-Neo Contra review copy for PS2

Or any other ones, I may be interested in. I can pay $50+ for review copies and $100+ for disc betas; even more for cart betas. WILLING TO ACCEPT AND PAY REQUIRED SHIPPING FROM MOST AREAS AROUND THE WORLD.

9/21/15 update: Added $1500+ bounty for Contra Spirits demonstration cart, with recent copy appearing on eBay

12/27/15 update: what bounty