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Preserve Your Games with the Open Source Cartridge Reader
(www.retronews.com)
Vintage gaming community.
Rules:
If you see these please report them.
Yeah at least with their parts lists the material cost is ~$134. So even the places selling kits for $150 are offering a pretty good deal for putting it all in a box for you. ( I assume they're able to make some savings buying in bulk but still)