Cleaning out the parts bin yet again, and I've got a well used suspension seatpost by redshift. It's a linkage system, rather than an elastomer, and the spring is tunable which is pretty nice. It's 27.2 and 350 length.
It's missing the rear cover (lost somewhere on a sierra nevada dirt road several years ago) and there is a bit of wear on the anodizing in a few spots. Works flawlessly though.
Asking for $140 shipped, but open to offers.
Cheers,
Collin in Poison Oak (land)