Best Buy has put the sony PS3 glasses on for 13.99. These are compatible with the Epson 3010/5010 (maybe other projectors as well?) I have 5 pair I purchased for $45-50 each a year ago after trying several different IR glasses and deciding I liked the image quality of these the best with my 3010.
These are NOT compatible with projectors that use RF to control the glasses, such as the Epson 3020/5020, for example.
It looks like at least in my region it does not allow delivery, and only a few stores show stock for in-store pickup. Lots of stores show up with stock though in some states. A great deal if you see some in-stock at your local Best Buy(s) or if it's in stock for shipping for your region And are in need of some 3D IR glasses.
due to the low availability, i'd suspect Best Buy is clearing out their stock and then will discontinue, but the website does not indicate clearance or discontinued anywhere, just that it's a "sale" price. If you use Amazon, there's a link on the product page for "tell us about a lower price?", they may match the price if people report the Best Buy website price there -- or they may not. (I submitted last friday with Best Buy's $19.99 price and sunday night the Amazon price was matched at $19.99... I planned to get some but put it off and monday morning it was back at their ~$24 price). No best buy's near me show stock, so hopefully amazon will match.