I recently purchased a 2016 Silverado LTZ Crew Cab short box with 34,500 miles for $33,000. Certified Used so it has the power train warranty extended until Nov. of 2022. It also has a limited new car warranty extended until May of 2021 which covers anything with the engine. 2 free oil changes also included as long as you take it to a certified gm dealer within 2 years of purchase date.
There are always good deals out there and the internet has made it so much easier to check that you are getting a fair price. Did you put the info into the below sites....they helped me out a TON when I was looking....
I also had a trade in......2014 Silverado Crew Cab Z71 LT with 94,000 miles......got $16,500 trade in value for that....
www.kbb.com
www.carmax.com
www.carvana.com