Includes touchscreen glass, integrated digitizer, LCD, ear piece speaker and home button. Replace a broken, cracked, or shattered iPhone 3GS display with this assembly. Compatible with all iPhone 3GS models. — 18 available at 69.95 each.
Sounds like you have damaged both LCD and digitizer... Cheaper option would be just to buy LCD display and digitizer of eBay... Although changing the digitizer might be tricky if you are doing it for the first time therefore you might be better off buying the whole thing as person above suggested :)