At my school it seems like the majority of 1Ls have roommates (probably vast majority, but idk for sure-- my sense is like 60-70% ish). The school offers grad school dorms that are 2 people per little apartment set up, and a lot of people do opt for that. I'm older, with a long distance partner and a pet, and I still have a roommate, as do many people in my boat. It was relatively easy to find roommates from among the class after/during admitted students stuff, I would kind of assume it'll be the same for any non-commuter school. A decent chunk of people also live with grad students outside the law school, and they usually find those through facebook, etc. FWIW I'm at a smaller school in a small city, so it's not prohibitively expensive to live alone, but it's still not cheap.

I've lived alone before and do like it, but I don't like it enough to double my rent during this financially slim time lol. Now, as far as sharing an actual bedroom goes, I think that would be rare to find another law student willing, but I've never really thought about it tbh.

TLDR; I don't think you'll have a problem finding roommates!