My family is on the $129 unlimited everything family plan on Sprint.
Sprint charges a $10 premium data charge for all smartphones so i don't really pay extra just for BIS.
At the moment I pay �35 for a basic unlimited contract (5000 minutes, unlimited texts and unlimited data) plus �5 on top for BIS. This is with three UK, would have been cheaper but it's an old iphone contract which ive added the bis service on top of
Myself, regardless of the calling tariff.. BIS is at around $18 pm for unlimited 3G excluding video streaming & tethering which is capped at 2GB pm. Unlimited Bridge access.