I've used email interac for a long time and is my preferred method of getting paid when I am doing online out of town transactions, which is the bulk of my business. I much prefer it to Pay pal.
In respnse to Catherine's comments about Credit Unions I have had a few customers that don't deal with a main bank pay by EMT and have a link set up on my web site.
http://www.coralmaster.com/purchasing_info.html
This process is more involved but can still be done.
Greg