I moved to Pueblo about eight years ago. The thing I love about this town, your cost on everything can be 20-50% less than Denver if you know who/where to go.
The range by the zoo is Pueblo Municipal Shooters: http://www.puebloshooters.org/ They have new member nights the first Thursday of every month. There is $60 admin fee, and then it's only $80 per year. Like Gunner said, it's 24/7 access after you become a member, which is convenient.

There is a range out east off 50. It's 15-20 minute drive outside town and used to be called Rivers Edge. I can't find the contact info for the guy who just bought it, but he's the brother in law of Ben who owns city pawn on the east side. Which brings up another thing. Don't go to the east side. Unless you are going to city pawn. They have given me some good deals, but it's an experience going there.

Watch the PWSA website. Since you were a member there before, you already know about the public hunter sight in weekends, weekday steel, and weekend matches.