Another forum member gave me a heads up on a killer deal. The listing doesn't say rebuilt, but mine are so know that about this part for sale...
FCP Premium Auto Parts has lower control arms (99634105307) on sale for $26.11. Now they're $33, but that's still a very good deal...
Mine wear out in the front every 2 years for some reason, so this is a cheap fix!
http://www.fcpeuro.com/products/porsche-suspension-control-arm-and-ball-joint-assembly-911-boxster-99634105316