Hi Gusku ... again!
I know ordering a snake on line is not what you want to hear, but sometimes it's the best method. There are many more snakes available to you this way, instead of hoping Petco has something you may like, or something you'll have to settle for. I got mine from
South Mountain Reptiles and the breeder has an excellent reputation. There are many breeders that frequent this forum.
As far as ...
"I also need help getting my mom used to the idea." .... you're on your own!