no way is a 1300 female $350-400. i know pastel females at that price are in the $800-$900
You can buy pinstripe breeder males from BHB for $350, Females are worth more, but not that much... you can get a 3 gene spinner blast (hatchling) for $950...
You have to take your reputation and the quality of your pinstripe into consideration. For a pinstripe of high quality coming from a reputable breeder I would say you could get at most $475. This number is based on the fact that it still short of the weight many people seek for breeding and also for the fact that it hasn’t been proven that the snake can lay viable clutches.
Also, in my opinion, you can't go around advertising this snake as a breeder yet for the two reasons I listed above. You shouldn't be breeding a female at 1300 grams. At the minimum you could do 1500 grams but even that is not the optimal weight.