My 1999 Honda crv has 104K on it and I know I need to change the timing belt...also know they recommend water pump change at same time...estimated cost of this??? Also, can I buy these parts myself at AutoZone or Advance Auto Parts and will a reputable car repair place agree to use these. Just thought it might be cheaper to buy them myself than to let a car repair place possibly "pad the bill" by overcharging on these items?