Well I just bought some y/y y/b today for $110 shipped with the bilsteins. Check out
Car-Part.com--Used Auto Parts Market and search for either the strut assembly (a lot more options and cheap) or the coil/spring. There are many options throughout the US and you can find them cheap. Just make sure you call the people and confirm they are y/y y/b.
Mine are coming from Wyoming and I spent two days talking to the people about the coils and what to look for. The girl I first talked to said they were y/b, which I quickly realized she was talking about the shocks. Then the next guy said the dots were grey/grey, which I found out he was talking about the leafs in the back. Finally I walked them through it and ta-da I have tundra coils for $110. It's worth it and you may find a deal better than me.
Where are you located?