From what I've seen , least here in Australia , breeders rarely sell their breeding stock unless
>>> there is some health issue (and they wish to avoid vet costs)
>>> the adult is knackered wrt breeding , ie at the end of it's life as an profitable breeder.
But keep in mind that it is VERY hard to raise lots of young hatchlings , incubating their eggs is the easy part, they eat hundreds of dollars worth of food every month, need lots of tanks to be raised in + lots of supplies, lights, etc. Most people are overwhelmed with all the time and care it takes and the hatchlings wind up either dead or sickly, malnarished, crippled, maimed and are often sold way too soon and before they are ready just to cut costs and try to make a fast dollar..
My advice , stick with hatchlings or juveniles who you will have to wait to reach maturity , or look at another species of lizard to breed that's not flooding the market where you are, maybe small geckos, or even better skinks , chose a species who only produce small litters of young.