There's a butcher shop in Catonsville, JW Trueth & sons that carries them.
Address: 328 Oella Ave, Baltimore, MD 21228
Phone: (410) 465-4650
I just put my line in a 5 gallon bucket and stick it in the freezer. It's a lot less hassle that salting them down. Just pull the bucket out of the freezer the night before. I also find it easier to cut the lips while the're still frozen.