Best thing to do is find a Betta club in your area, they exist in most states. Make friends, see if anyone is breeding what you are interested. Club members usually sell to each other (or exchange for free if you are lucky), especially with beginners. Good luck! Yellow breeds true, so if you get both male and female - you are in business. If you can make it to an IBC show, there is always an auction afterwards where you can pick up pretty amazing fish for fair prices.