No, you CAN NOT use 30-30 ammo in a .303 Savage. Try Midway for ammo. Some guys at gunshows have ammo for older guns. The .303 Savage is a fine round in the same class as the 30-30, but the ammo is not interchangable.
Depending on where you are the values is probably between $500-750.
Bummer about the fore end. That's a nice gun.