Used BMW M3 convertible for sale under £20,000

There are 39 used BMW M3 convertible under £20,000 for sale from UK dealers on AskCar, as of 30 October 2026. Typical asking price £17,500 (the median: half cost less, half cost more). The cheapest is £9,995. AskCar lists 811 used BMW M3 across the UK, from 464 dealerships.

The middle half of the 39 cars are priced between £14,700 and £18,900.

As of 30 October 2026, AskCar lists 580,490 cars and vans from 12,695 UK dealerships, read daily from dealer websites: over 99% of UK dealer used car adverts. No dealer pays to be listed.

4 of the 39 cars had their price reduced in the last 14 days to 30 October 2026.

Cars for sale now

Best value first: the cars priced furthest below their AskCar estimate come first, and those without one come after. The AskCar estimate is our expected asking price for that one car, from its model, age, mileage and specification, using the 758 priced BMW M3 adverts on AskCar as of 30 October 2026.

Each car: year, make, model, engine and trim, power, gearbox, fuel, body, doors, colour; mileage; price and its changes; how the price compares with the AskCar estimate; emissions standard and ULEZ compliance where it holds; MOT; dealer and town; AskCar page.

Cheaper cars like each one, with its price history, are on its AskCar page.

BMW M3 by gearbox, fuel and body

BMW M3 convertible by price

BMW M3 prices by year

BMW M3 by price

Convertible cars under £20,000

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