Magpul is selling two new AR-15 compatible grips. The MOE-K is a slim and compact grip designed for compact AR-15 variants (Personal Defense Weapons) or for people who prefer smaller grip circumference. I really like the look of this grip. The MOE-K is selling for $19.95 and is available in Black, Flat Dark Earth, OD Green, and Foliage.
The MOE+ grip wrap-around rubber overmolding, similar to Houge grips. It is only available in black and costs $23.95.