ST Suspension 90222 and 90223 Coilover Kit - $773 shipped!
On amazon.com. Search for "st coilover 90222" for non-M or 90223 for M, it will give you price $1200+ something, but look a bit below where it says "2 new $772.xx" and click there. It says "temporarily out of stock" at the moment but you are allowed to put the order and you'll get the kit when it becomes available. Regular price of the kit is 1K and more (cheapest I can find is 900+, close to 1K).