We considered at the Big Country 3155. Nice trailer for the price for sure. For our needs it had the best value in the price point.
When I was shopping around we were looking at a 2017 leftover in 2018. MSRP was listed at 84K and best deal I could find online was 57K. That's close to 32% off MSRP.
We are looking at a price point slightly higher and for Heartland that would be a Bighorn.
Did a quick internet search and noticed a 2018 3155 at 59K.
I'm thinking the price you listed is not to bad but you might be able to do better depending on if you are willing to travel to get one. And depending upon if having a relationship with a local dealership is important or not.
Just did a couple quick checks at dealerships I had on my list for the Big Country.
http://www.lamesarv.com/2018-Heartland-BIG%20COUNTRY-LN110350LeMasa RV has it at 57K but with an MSRP of 83K.
Not sure I would trust the MSRP to be real or not. You have to consider the options on the trailer obviously. Some say anything over 25% off MSRP is good. Some day shoot for 40% and get 35%. Depends on a lot of factors I'm sure.