I thought I'd give a summary of my Redcard buying excursion today in MD in case it helps anyone.
Pikesville, MD - Since this is the main Target near Baltimore, I was only able to find 2 Redcards near the cashiers (it's possible there were some that I missed). When I went to CS to activate them, one of them gave an error, which the CSR called "defective". She went and found another 2 somewhere, one of which was also defective.
Towson, MD - A bunch of Redcards on the racks. I taught one of the cashiers what to do, and she activated around 15 for me.
Aberdeen, MD - Stay away if you want in bulk. CS and employees have been instructed that only 1 per person, and they wouldn't give me permission to take unactivated cards. I suppose you could try going from cashier to cashier, but I didn't want to cause a חילול השם.