1 Behind-the-ear (BTE) hearing aids cost between $450 and $5,600. 2  Economy Hearing Products offers a very basic BTE hearing aid for about $630. 3  ReSound Azure retails for about $2,600 with programmable volume control settings, an open fit to minimize a plugged up sensation in the ear and a 330-hour battery. A hearing test is required before purchasing a hearing aid. 2  The test determines if a hearing aid is necessary and what type might work best. 3  Hearing tests can be free with the purchse of hearings aids or cost up to $250. 4  See How Much Does a Hearing Test Cost.