We fitted a 3 blade variprop made by spw in Germany. There are certainly cheaper solutions such as kiwi, versions with easier pitch adjustment: J prop, the “Rolls Royce”: max prop. Originally we were very tempted by the Volvo folding 3 blade prop with bizarre blade shape which had a certain appeal, but couldn’t find someone on the web to advise whether it worked in astern (well except volvo, but they would , like any manufacturer!)

None of the above is a cheap alternative but they can improve performance under sail and get you back to the club more easily when the wind lets you down.