With an Uno with chip in socket, if you have a bootloaded spare (they come blank, you can bootload your own on a breadboard) then if you burn a pin you can pop the spare in and keep going. Last time I bought a few (discount each from when buying fewer) they ran me $2.15 ea.
BTW, a Nano and a breadboard costs less than an Uno but burn a Nano pin and the board is junk. So be careful with those pins!