Here the cheapest new standard range Model 3 is 50,000 euros and long range 62,000 euros. Cheapest new i3 is around 42,000 euros, though they don't mention REX anymore. No used model 3:s are available on the free market so can't compare those.
Sources:
https://www.tesla.com/fi_FI/inventory/new/m3
https://www.bmw.fi/content/dam/bmw/marketFI/bmw_fi/ladattava...