Check with the shops in Sofitel or Rayyan Road. I don't have the exact prices of those items but can give you a hint as I bought some parts recenly.

Intel Processor i3 3.3Ghz - Qr. 450 so i5 will be 500
Intel Motherboard 2nd Generation - Qr. 250 3g could be more
Power supply - Qr. 85
Ram 4GB - Qr. 85
Hard Disk 500GB - Qr. 230

The above prices are what they ask but you should bargain for the best price.