@knud @Gargron It can vary tremendously depending on the film, the lab and whether you want prints, scans or both. Even the camera, too - a TLR will typically give you 12 6x6 shots per roll of 120 film, but other cameras will get you 16 (6x4.5) or only 8 (6x9).
Assuming a TLR and medium res scans on Ilford HP5+ film, you're looking at around £1.60 per shot at the lab I use.