Victorinox will replace the scales for free if you send them the knife. I've sent mine in for the same thing, and turn around time was about 2 weeks. In the meantime, you can get a spare classic at Target for about 8.95, or go to sosak and get a hold of felinevet (Tim) and buy one for just a couple dollars and free shipping. At soask online felinevet has a list of sak's for sale and always really dirt cheap. Both new and lightly used. The money goes to help vet bills for people who can't afford it, so buying something from Tim helps needy cats.
You can also buy scales for the sak, and put them on with Goop, the preffered adhisive among sak fans. Or make your own out of some nice wood, and stick on with Goop. The factory plastic scales just snap on. Over time, the plastic can shrink a little causing the scales to become loose, and come off if dropped. If you buy the eccono scales, they are made out of nylon, and are more durable.
In any case, the Victorinox warentee is iron clad, they will fix any sak, no matter what you did with it, or how old.