Those brake lever/shifter combos are no longer available new. The good news is they are relatively inexpensive. You can get new replacement Shimano ST-EF500 Brake/Shift Levers for about $20 each (need one for each side) and they come with new shifter cables and housing (but not brake cable and housing) which you said you need anyway. Either buy new and replace or check on Ebay or with local bike shops to see if anyone has a good used one.