I'm trying to find some pursuit bars in 48cm. So far, the only option I've found are Soma Urban Pursuit, but I'd like to get something with a drop. Actually, I haven't even been able to find a 46cm bar with a drop, which I'd settle for. Am I out of luck?

That's a fairly uncommon size in pursuit bars. I think Mavic made a 46cm pursuit bar in the 80s-90s. They may have made a 48cm. Check the used markets. Good hunting.