have a 2015 sierra, would like to level it out, could you give an estimate on cost?

There are several ways of doing this. If you give Toby a call, or better yet, stop by and see him, he can fill you in on your options.

I had my 2014 RAM done a month ago with new front shocks and struts and leveled and it was around $700

I'm sure if you call the shop they can give you an estimate. Or even swing by and talk to them