In theory I won't argue with Steve's suggestion but in practice the absolute cheapest springer may not be the way to go. Try to find a deal on a Ruger Air Hawk, Black Hawk, or XS-25 from Flying Dragon. Mike did have a great deal on some low powered XS-25 units. These are some of the least expensive guns with internal parts most closely resembling European guns (because they're clones of a Diana 34). They won't be exactly like your Weihrauch but they will be very close.