Deb, I agree with the answers you have received here so far, especially the line "you get what you pay for ".
Interview several agents and ask them to provide a market analysis of your home, including the co-broke commission (the amount offered to the buyer agent). of the homes they use for comparison. You should expect to pay double this as most agents split the commission 50-50 to attract buyers who are working with agents other than themselves.
If the commission offered to a buyers agent is low, you can expect human nature to take over and you will generally see fewer showings as these agents "may" be unwilling to work for the offered commission amount and will not show your property. This goes against the general Realtor Code of Ethics, but is something I see and hear about everyday.
Good luck with your decision!