What chipcom said.
Plus, if you go through a period where you flat regularly you are going to be poooooorrrrrr.

I had troubles with one tire last fall. I flatted something like 10-15 times before I gave up on it.

$5 + $10 in labor to change the most basic of bike problems.
Being self sufficient.... priceless.

spare tube: $5
patch kit: $2
pump: cheapo pump at performance $10. Nice pump $25
tire levers: $4

You can dooooooo it!