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One time I bought the cheapest bike walmart sells which was also 50% off for black friday and I asked for the unassembled box so I could build my cheapo $50 bike myself, and the employees were floundering around for 20 minutes because literally nobody has ever asked this before and they kept asking "are you sure" looking at me like i'm dumb for turning down a free assembly, and then I followed them to where they kept their overstock and the box had been sitting in the partially open outdoor section and the box was water damaged from rain and when I finally opened it at home, the frame had damage on it.
Just buy a swapmeet bike.