I normally use NAHUNTA at the NC Farmer's Market in Raleigh, as they usually have the best prices that I've found. Just plan ahead if you need a large quantity and let them know in advance.
BJs and Costco SOMETIMES have pork at fairly resonable prices.
Tom (aka "Another_Q_Lover" & "BBQ.TOM")
CMJ w/ KCBS
CBJ w/ MBN, NCPC, NCBS, & NCBBQA
OBJ w/ BBQ Critic.com
CTC w/ KCBS
Pitmaster and Chef - 4 Lil' Pigs Competition Barbecue Team
Author of "A 'Q' Review"