Still around, but chromoly is the expensive form of steel, and people who want higher-end bikes to be steel are a bit of a niche market. There's plenty of high-tensile steel bikes being manufactured, many of them sold through the big box stores.
Basically, aluminum can be both fairly light and cheap, while steel needs to be pretty expensive to be light.
I have two bikes with mid-1990s steel frames, and they're absolutely wonderful rides. If you want to get affordable but great chromoly frames, you might want to look for used rather than new.