XP-G XP-E 60 degree flood optic - US Seller - $1.50 each shipped
http://www.ebay.com/itm/370587997332#ht_500wt_991
Fits 3.45 mm emitters. Tried it with an XP-E and it fits nice and snug, so the optic and emitter are perfectly centered every time.
Beam angle is a legit 60 degrees. Very even and smooth inside of 60 degrees.
Dimensions are 16mm wide, 11mm tall making it kind of an odd size.
I got some to use with these emitters for low output home lighting and DIY headlamp projects and I really like them. I like them more than the Carclo optics I've used from LEDSupply. The beam is wider than a wide frosted Carclo optic and beam smoothness is about the same. Centering the emitter is easier too.