The short answer is you get what you pay for. Some attorneys offer cut rate prices and do very little in return. If you are serious about avoiding the dangers of foreclosure and a deficiency judgment, you should be less concerned about price and more about quality.
If your house is worth less than you owe, the Bank has the right to seek a deficiency judgment against you for the difference. Many banks will give up that right to avoid a lengthy difficult foreclosure. A deficiency judgment could be $100K or more. Don't eat cheap sushi and don't hire the cheapest lawyer. Neither one is a good idea.