Asking price on their website is £11,000
https://goodwin-business.co.uk/car/1938-lancia-aprilia-ardennes/I don't know if that's a fair price but try finding a good prewar Aprilia project. On the other hand, buying one done is looking good value at the moment, again subject to finding a properly 'good' example.
Speaking as someone who's in an Aprilia project at the moment, I thoroughly recommend that state of living to anyone wavering before jumping in; just don't expect a profit at the end of it!