Just find a supplier and buy some, they about 5c a piece anyway .. less if you dig around.
Try a digital clock/digital timer.
if its digital then it will need a microcontroller to drive the display
its cheaper to then incorporate the timing app into that so i dont think that there will be a 555 there...
as frollard says, they are "largely outdated" and i could not agree more; they are pretty cheap though
Very few use the 555 ic, because it's largely outdated by microcontrollers. They're super cheap online (ebay, mouser, digikey, etc)