If you want to go very cheap, the G15-DLP glasses are pretty much the cheapest you can get, and the quality of the 3D is actually very, very good, at least on par with the Estars I have. The downside is that the construction is about as simple as can be so they're not as comfortable... unless you're like me and both wear glasses and have a big head, in which case the arms of the G15s don't use as much pressure as the Estars do. They've also got smaller lenses than most, which might be an issue depending on how close to like to sit. I'm perfectly happy with the G15-DLP, and at around $12 per pair they're pretty much impossible to beat for value. Comfort is a big question mark (some people like them, some hate them) but for the price it's hard to deny that at the very least they're perfect backup pairs or extras to have lying around for company.