I have a set I ordered with a Kifaru 6 man tipi a while back and use them several times a year--I think the SST is short for sand, snow, and tundra. Not great for backpacking and no magic to them, but good option when you need more anchoring force than a shorter stake will provide and you are driving them into something that will hold and isn't too rocky. I've never used them on tundra, but good on sand and snow unless either is too loose, in which case I go to dead man anchors. No idea on a fair price.