How much money do you have, what game and structure do you want to play?
UB, PS, Doylesroom, and
Bodog all have limits down to 1c/2c but I would start at 5c/10c. Doylesroom also has a lot of really cheap SnGs. Absolute Poker is another choice. You can earn bonus at all levels on
bodog and UB. Actually, I don't think
Bodog has 1c/2c.
UB and PS have the most traffic
Bodog and
Doylesroom have a good traffic for low limit NL, DR has good limit traffic too. Pokerstars and UB are my main site, I like DR, and just deposited at
Bodog.