Timing and patience. They have been few and far between lately and several tuggers have been waiting patiently (or not so patiently) for them to appear. I believe there is pent up demand and not a lot of supply right now.
At this point, anything south of a penny a point is probably not bad, especially for a decent sized contract like you're looking for. the real small ones will go for less just because the closing and transfer fees eat up all the value.