http://www.packet8.net/
$20.55 anywhere in the US... Uses Cable or DSL modem for first part of the connection and then switches to regular lines so it doesn't sound like an OnStar commercial (Voice over IP).
Right now they seem to be experiencing an ASP problem...
http://66.102.7.104/search?q=cache:i...hl=en&ie=UTF-8
When the site is back up use bbphone for a coupon code for a $20 discount on service... I guess they give you a month free... googled for a coupon code, probably a resellers...
BTW, google makes a nice search engine for coupon codes if you ever want to buy something on the internet for less...