I've always wondered what the availability of relatively common North American snakes is in other places. For example corns and bulls and kings--- are they available in any quantities? What are the prices? Those gophers you have would probably go for about $35-50 as babies. More for adults of course.
I'm sure that Europeans would be amazed to see leopard ratsnakes go for hundreds of dollars over here. What is available in the Israeli herp market? How common are Pituophis? I would certainly encourage you to breed those.
corn snakes and king snakes are very common and the prices at breeders (the stores set their own prices) are about 65$ - 120$ for baby's, depending on the morph. also king snakes tend to be a little more expensive then corn snakes.
as to Pituophis, gophers and bulls used to be more common in the 90's but doe to low demand they stopped importing them. these days they are not that common tho not rare baby gopher or bull cost about 100$.
pine snakes aren't very common today and finding a pair is very difficult.