May be a couple days late for you ry, but Captain Mac's on rt. 54 in Fenwick sells them. I was there last week and bought a DE license, but saw they sell MD too.
Fishing was ok the one night I got out. Fished the surf on the Fenwick side of the border from 5:30 - 7:30 pm. Surf was managable but there was a pretty good wind out of the south. I was chuckin bait on the 10 ft surf rod but still needed a 4 oz pyramid to hold bottom. Caught a few small sand sharks (Dogfish) and a monster skate, biggest one I've ever caught...man are those things a PITA to unhook. Enough action to keep me busy though. I love unhooking the sand sharks and walking them over to my wife to get the obligatory "that's nice dear, now put the baby shark back."