Replying to Where to buy old ski models

So I'm looking for a new pair of skis to buy, preferably ON3Ps or something similar, but I'll take whatever I can get as a broke ass college student. People always tell me to just buy models from a few years ago, as they'll be about as good but significantly cheaper, which I'm very down with, but I can never find any old models (unused) for sale. Everywhere I look often have the old models on the site but are out of stock. Just wondering if anyone knows a place or site that is actually still selling old models or how to find them?