Maybe the English made Gamo's like a 1250. I would think more along the lines of a Diana 54 in .22 which may be about tops for a springer. The Diana 350 is readily available used in excellent condition. A rather long gun that is not easy to shoot well out of the box. It is said they take a good bit of practice to sort them out but, once done, they are quite accurate and hard hitting. Which is why you see them listed for less than $300 (sometimes $250) with only a handful of pellets through them.
Yes, you will have more luck finding a .22 in something other than a Gamo.