Mojave hatchlings can go for $300+ so a breeding pair should be more. Just saying. Breedable females that are not problem breeders can go for more than $100. Lots of the $100 ones are "problem breeders" so you have to make sure you trust the guy selling to tell you if they've been breed, been attempted to breed but didn't take, or bred but laid slugs or few eggs.
Now.. a problem breeder for one person can be a superb breeder for the nex owner. So it's really up to you as to which set you want more. But it's basically one morph and 3 normals or two morphs. Both morphs offered are co-doms with supers. The mojave pair will make you supers the first time you breed(possibly), while the fire x normal will only produce more fires, but you have 3 females to breed to him, so you'll have potentially three clutchs, vs only one clutch from the mojave.
Lots of good points with either deal. Which do you like better, and what else can you do with the ones you buy other than just using them with each other? Do you have another female already to breed? What other combos could you make with the ones you buy and any you already have?
Good luck.