If you stick with very basic you are probably looking at 30-35k. If you go plaster interior, no water features, no hot tub, no heater, basic tile & minimal decking the cost will stay low.
Even without a contractor, you couldn't build a pool for $35k in the Waco area. Not sure about Temple but I imagine that it is similar. My friend who contracts pools had a customer want him to do a pool for a budget of $30-$35k and he said he couldn't even do it without charging contract fees.
We had an estimate 3 years ago when we built ours. That was the base cost for a very basic pool 20' x 30'. Ours ended up being quite a bit more because we had a lot of upgrades. We also got three bids & that was the lowest bid of the three.
It was a recommendation we got from a friend. I will see if I can find the paperwork. We ended up going with a different contractor that was a little higher on the cost but listened to what we wanted.