In the areas around Camp Pendleton it's quite easy to find Marine Corps MARPAT boonies at thrift stores. Most are quite new or show just a few signs of use, such as this one whose main problem is "pilling" on the sweatband:
This one - well it was rode hard and put up wet. It was in a trunkload of uniforms and gear I got yesterday from a Marine. This was worn during his last deployment and between the salt stains, corroded vents and frayed lining, the thrift stores would throw something like this in the trash.