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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.
Source is here if you want it to feel more open source by building it yourself. See if you can do it for cheaper after factoring in your labour time.
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)