Depending on the quantity H MART always has live blue fin crabs (females) in the seafood department. Not from that area but the only other place remotely close I know of is Casey Crab Co on 198 near Ft Meade.
Captain Dan's Eldersburg, on Liberty Road at Monroe. Just over the bridge. Just a bit west of where you're asking but not far. Lots of good seafood there, you cook or they will. They have a website with prices.
I live in EC but drive to N.B.S. seafood on Dorsey Rd in Glen Burnie and I'm never using disappointed.
If you like to steam your own crabs and you've never tried them out, I would highly recommend them.
I've never once gotten a dead crab from them, and even if one managed to slip through they always give you 14 crabs when you buy a dozen. Their spice is great and the owners Nancy and Bill are a pleasure to deal with.
I also think I've seen them as a sponsor on some gunsmith website so it's an extra bonus to spend money on 2A supporters.