i'd imagine they put up a pair of goggles every couple hours or so, and they're often a pretty cheap pair of high quality goggles. otherwise check out sites like the clymb and seshday because they always have nice goggles on the cheap.
I bought a new Smith I/O with two lenses off ebay for $90 from a reputable retailer a month ago. You can find some uglier colours for ~$70. Probably similar for other brands with interchangeable lenses.
You should check out smith phenom, they perform really well, you can replace the lenses and they don't have the hefty price tag of the more top range goggles (eg I/O), you should try and get them on a deal (last season or used as a stand example at a shop).