Yeah you're probably out of luck in the singles department. Pavilion probably has the best selection in NMB, and if they don't have singles, I don't know who would.
Greens on 29th N in Myrtle is your best bet for singles. They don't break apart everything, but they have a small amount of stuff that I usually won't buy a 4/6 pack (because of price, not quality) of but I'll pick up a single to try.
It's in Myrtle. It's on the same avenue that runs beside Broadway at the beach. Half liquor half beer. They close at 7 though (with the liquor half), so if you go, get there before then.
The only singles I saw were German beers and such, beers you wouldn't find in a sixer to begin with. Didn't see anything Coast. Even the taps were unspectacular, but damn it's hot as hot as it's ever been with no let up in sight. Thanks to Tom for the HT and my dad for the Shape of Hops I'm doing ok.