A bargain and sale deed is especially used by local governments, fiduciaries such as executors, and in foreclosure sales by sheriffs and referees. The fact that it comes without any warranties from the government means that the new owner may not have good title. If in fact, the city did not have good title or the city could not convey good title, then the new landowner is unlikely to be successful in obtaining a refund of the purchase price.
Some states require a specific form to be used. Some states also allow a grantor (or seller) to add warranties. In such case, it may be called a bargain and sale with covenants deed.