I wish I could interact locally with trade or services around St. Louis with bitcoin

Has anyone considered making a site similar to Craigslist that people can trade goods and services for bitcoin?

Looking for advice. I’m currently paying around 240 a month on gas to heat my office. I’m thinking of buying a couple S19s and use the heat from those for the office. What rate of electrical would I need to be under for this to make sense. Keep in mind electrical cost would be tax deductible since it’s used to heat office. Any thoughts? Thanks I’m advance!

Any advice on combining my utxos?