Also, don't look into any type of "breeding loans" etc... Usually these don't work out well unless you really know the person and get everything written up in a contract first.
You may want to consider purchasing juvie animals as well... Getting adult breeders will decrease the time you have to wait to breed but there are trade-offs... They may be getting rid of a "proven breeder" because it isn't performing as well, has health problems, etc. They could just be selling an animal when they have a more expensive one to replace it, but you never know.
Also, starting with a juvie, you will spend less upfront, this will be made up with the cost of feeding it, but often you can have a wider selection of animals to choose from and you can possibly pay more $$ and get a higher quality baby for the same price you'd pay for a lower-quality adult of the same morph.
I would agree with the others that you will want to do lots of research before hand.. Make sure that you want to work with mojave and have plans for the future. Mojave is a simple co-dom gene and is not worth much as a single gene animal. Yes, producing a BEL will sell for more, but there will be normals and mojaves produced in the same clutch, so you need to be prepared to feed and care for them all until they can be sold.
Morphmarket, faunaclassifieds, and kingsnake are good places to go. Some fo the FB ball python groups also allow sales, so you can post there too. Just do a BOI search on any potential seller you are thinking about dealing with. There are a lot of scammers out there.