> Where do I buy one of these cheap Teslas people are selling for political reasons?

Wherever your locale buys and sells used cars. The price of used Teslas has been dropping at a ~24% annualised rate over the last 30 to 90 days [1].

[1] https://www.cargurus.com/research/price-trends/Tesla-m112

Pretty much anywhere you would buy any other used car. Model 3/y used prices are down 20% yoy (compared to ~4% all cars).

There have been cheap used Teslas for years. Just was searching Cragslist a few months ago, and found Model Ss for $15-20k.