Super mojaves are going to be the 'cheapest' of the BEL complex, but they're not the whitest. They have grey on their head and I think some dorsal patterning. A whiter snake is going to be something like a lesser/mojave or even a super lesser. I've seen male super mojos for $800+ and lesser/mojos for $1000+ (I'm thinking VMSHerp here). I think mojaves are going to be the cheapest of the codoms (~$150 for a male), but lessers and butters are coming down and I don't recall seeing any russos for sale recently.

If you're going to be breeding, though, do you really want the cheapest snake you can get? You pay for quality and high-quality snakes (imo the only ones you should be breeding) are not cheap. If it's a pet it doesn't matter I guess, but if you're asking about price just to buy the cheapest example of a morph to make more poor examples of a morph I would probably reconsider.