Even if you get two rats (one male one female) to breed, you will probably wind up with a LOT of extra rats with one snake. I would order from big cheese rodents. never let me down. Go back to the pet store, demand your money back. Tell them these are unfit for use, and if they refuse you'll simply turn them into the better business bureau.
What most people don't realize is that everything purchased MUST come with a "fit for use" type warranty. Federal law. This means that if you buy mice, they must be fit for use upon purchase - they can't be rancid (as yours are.) If you go to a lumber yard and purchase 100 2x4 studs and get them delivered and they're all warped... they legally have to take them back because when framing a house you cant use them. they are not fit for use.
It shouldn't take long to get those mice from the mouse factory... just a couple days shouldnt it? (i never have ordered from them, i order from big cheese. i order monday get my mice on wednesday or thursday. depends on what time i place the order.)
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-Chris
0.1 Licorice Stick Black Rat
1.0 Black Rat
0.1 Vietnamese Blue Beauty
1.0 Green Tree Python
0.1 Texas Bairds Rat
The educated are the few. The uneducated are the masses.
North American Rat / Corn Snake Care Sheet