Being a cheap b*****d, I 've gotten my cell phone expenses down as low as I possibly can.
I use a Net10 prepaid phone.
http://www.net10.com/ Every month I order a new refill card that comes with a free phone. I donate the phones to
Cell Phones for Soldiers and use the cards in my phone so that I can keep the same number.
Net10 has two options, $25/30 days 750 minutes w/ a free phone and free shipping
or
$50/30 days unlimited w/ free phone/shipping.
Use coupon code "44477" to get $5 off, bringing the price down to $20/$45.
Plus, click through to Net10 from Mr. Rebates and get 15% cash back.
www.mrrebates.com
That brings the true cost down to $17 or $38.25.
Maybe a bit too complicated if your only going to need a phone for 30 days or so, but it works for me.
Edit: I forgot to add that they charge sales tax, at least in Alabama.