[404compliant]

Con prices have always been a bit higher than regular prices. If you know what you want, get it elsewhere. The vendors try to compensate the traveling, hotel and ticket costs. But you may get things that are hard to get otherwise, or only with insane shipping costs.
Also, a lot of things are hand made by the sellers, where you can see and compare with your own eyes what you'll get, and buy it instantly, instead of maybe waiting in line for a year for a plushie commission slot.