Reddit reviews Genuine Recesky Retro DIY Twin Lens Reflex Black TLR 35mm Holga Lomo Camera Kit Minimovie TLR Camera Kit (68 Pieces Kit,Uses 35mm 24 Exposure B&W or Color Film）
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Good question, but I think nothing goes cheaper than the Recesky TLR 35mm. It's a $15 DIY camera, quite tricky, but not hard to build and easier to use.
I have one, and I'm in love with the results.
Link: https://www.amazon.com/Genuine-Recesky-Reflex-Minimovie-Exposure/dp/B01921EQ3O
This is the cheapest one I've used.
Can't get much cheaper than that! :-)