Teams that are looking to get the most bang for their buck typically avoid free agency.
The nature of 32 teams bidding for a player's services on the open market artificially inflates their worth, leading to teams drastically overpaying for talent. These deals usually take place in the first couple days of free agency. However, as the days continue to pass by, those inflated prices start to drop to the point where real value can be found by the savvier teams that know where to look.
In recent years, the Cowboys have decided to do exactly that, sitting out of the high-priced bidding wars in an effort to uncover value with the lower-tier free agents.