Did you search spefically for spin classes called that? Because "spinning" is actually a trademarked name for a specific company. The classes I take at my Y are called "indoor cycling". It is the same thing as true "spinning", it's just the the instuctors and programs aren't necessaraly trained by or from the company that trademarked "spinning".

If there is a class at the Y in the town where you work would you be able to fit that class in either before or after work? I currently spin at least twice a week before going into school and I love it. I can't believe how much stronger it has made me on the bike, and now I can actually do standing climbs which I couldn't do before.

Good luck finding a class!