I bought my purple albino SD male from a guy that paid $950 for him. He gave me the original receipt. He bought it about 2 years ago. I don't see many SD retics for sale anywhere. I wouldn't mind getting another female with some more genes, I'm really excited about moving this project forward.
i also have an ARS rat breeder rack and have hundreds of rats in there. Takes me about an hour to clean all 20 tubs once or twice a week and I crank out hundreds of rats. It takes me only two minutes to top off the water and feeder trays every couple days. I have way more than I can use, I just threw 100 rats in the freezer last week and still have at least 100 more in the rack. I'd say I go through about $25 a month in rat food, and all the bedding is free shredded paper I get from work. That price also includes all my mouse breeding too, most snakes eat 1-4 rodents per week, some eat none LOL. some of my long thin King snakes prefer multiple pinky mice, and some I feed twice a week, especially when the come off of a fast.
I'd say it costs me about $1 per month per snake to feed them (50 pounds of food). Of course my rack was about $1,800 to buy new with shipping, but it pays off quick. I'd come out ahead selling rats at $3. I'd say overall it costs me about $25 to produce 100 rodents of various sizes, that includes at least 15 large or jumbo rats.