My intel 3820-E is putting out 50 Kh/s, so yes, there are CPUs that can do better than some low end (< $100) GPUs.

Is it more price efficient? No.

Hello Here is a new mining pool for mining Rupee.
It's based on YiiMP, no registration is needed :

• Stratum  : lycheebit.com:3433
• User     : YOUR_RUP_ADDRESS
• Password : c=RUP

• Website  : http://www.lycheebit.com/
• Payout   : Every hour
• Fee      : 1.00 %

Exemple of CCMiner command line :

Happy mining