There's no way to tell the difference, period.
And just a piece of unsolicited advice...you need to evaluate your goals with your group of snakes before you purchase a group of hets.
If your goal is PRODUCE albinos, buying a group of hets is the way to go.
If you are simply looking to OWN an albino, but the price tag deters you, and the cost of a pair of hets seems more reasonable...consider this:
I would argue that the cost of purchasing, housing, cleaning, feeding, and breeding a pair of hets in 2-3 years would be a lot more than the cost of an actual albino right now. There are a lot of hidden costs that your incur along the way that a new keeper couldn't even fathom right now. Not to mention, when you get to that point, you're only looking at a 1:4 chance per egg of getting an actual albino anyway.
Just my .02....