Prices vary greatly depending on manufacturer and type of casting and machining work. Right now a stripped basic lower is about $200-$300 depending on manufacturer. They can be $600 or more for a Colt or other premium name. Panic buying in the last couple months have made a roller coaster ride on all this stuff. So you might see higher prices - but the $200-$300 is pretty common for the most basic of stripped lowers on GB right now.