Pretty cool idea, a vertical grip that contains a retractable bipod.
http://www.ustacticalsupply.com/grippod.shtml
http://www.ustacticalsupply.com/grippodadvantage.shtml
EDIT: Kokanee just provided me with the airsoft version, I'll post the link here. Thanks bud!
http://www.wgcshop.com/pcart/shopper...3BK_cat_Bipods