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Just out of curiosity, how much did you pay for the parts?
I got the CP2102 USB to TTL converter off eBay for a $2.00
From Digikey, which is not known for cheap parts, I ordered:
Resistors: $0.04 ea
NAND gate: $0.45
capacitor: $0.19
diode: $0.39
A few bucks total for components alone. Probably closer to $15 if I included the total cost for shipping, and the unused components I ordered to get volume discount.