There is a good deal coming up on Rebtel.com. Buy $10 and get $20 bonus. That make it $30 worth of talktime for $10 only. You can also dowlnoad rebtel app on Iphone and Android phone, or use regular landline or cell phone. At the rate of 17 cents/min, $30 will give you 174 mins. Promotion is valid on 13th may only.

http://www.rebtel.com/en/landing/af/mothers-day-madness/