I'm not aware of any robot shops in Egypt, but I would guess that you could find an imported R/C car for cheap in the market and take the wheels (+ whatever you could use).
Perhaps there's web shops based in Turkey or Greece, but it may be worth checking some of the shops in India, even if the shipping is not local, their prices are better than eg. UK and the US.
Just Google with the terms "robot-wheel price site:*.in" (without the quotes).
Or check these sites