Does anyone know a shop or vendor that has the best price on these? I got quoted $380 but he is in back order until Mid june. Cannot wait that long because I need them asap so I can get my car tuned/dyno'd already!

 

take a look here:

https://my350z.com/forum/engine-365/

 

That is a good price. Not long ago, I was in the market for such. Last week, I was very fortunate to find a brand new pair from a Nor Cal member