There are certainly check raise bluffs in the low limits. I see this all the time when someone raises preflop and bets after the flop. However, the board is usually low in these cases. If there was an ace or a queen on the board and no other face cards, I might call the flop raise if it was small enough and see what he does on the turn. It also depends on the player. A lot of people will check raise you with top pair, some need a stronger hand, and some do it almost strictly on a steal.