I have the Sprint SERO (Sprint Employee Referral Offer) plan for $30/month plus $5.00 for voice dial. My final bill is usually about $38/month:

Sprint Fair & Flexible Plan
* 500 Adjustable Anytime Minutes
* $30.00 Minimum Monthly Charge
* AMERICA - ROAMING Included
* Nationwide Long Distance Included
* Unlimited Night & Weekend Mins. Included
* Nights: M-Th 9PM-7AM Wknd: F 9PM-M 7AM
* Unlimited Vision Access
* Unlimited Mobile to Mobile
* Caller ID, Call Waiting
* Three-way Calling
* Voicemail