Ability to accept eCheck through Authorize.net

This can potentially save your customers thousands of dollars in credit card fees and opens the door to more business/success... We have been accepting check by fax and email for several years and it is one of the best tools that we have implemented. To have this capability in our online store checkout would be wonderful... I think many of your customers could utilize this...  I mean who wants to give away 2.5 - 3.5 percent of our sales?