I've got one of those tarps. They're not bad. Honestly, I was a bit disappointed in the toughness:weight ratio; it's made of ultra thin MARPAT nylon ripstop (70D maybe?) with blackout coating laminated on the back to make it water resistant. This greatly increases the weight, and doesn't seem as durable as some of the other materials Duro is producing in Multicam for mil tarps.
Speaking of sweet USMC kit....how about an ILBE Corpsman Assault Pack for $99?
http://www.unclesamsretailoutlet.com...015355377.html
Quite a few USMC goodies on the site, actually.