Here is the iPhone 3GS (16GB & 32GB) Price in Saudi | Mobily Network
iPhone Prepaid 8GB
Price : SR 2199
Free Data : 250MB/monthly
Commitments : 6 months
iPhone Prepaid 16GB
Price : SR 2599
Free Data : 250MB/monthly
Commitments : 6 months
iPhone Prepaid 32GB
Price : SR 2999
Free Data : 250MB/monthly
Commitments : 6 months
iPhone 3Gs is being distributed by Mobily and therefore available in Mobily outlet all over Saudi Arabia.
Source : Mobily Site