Spare tube
Tire levers
tube Patches; so small there really isnt an excuse to not have them. I picked up glass in one tube, then a staple 3 miles later on the spare so that patches saved me.
$20
A few bandaids. Again, so small that there isnt a downside . I wore an ill fitting jersey one day and had some chafed spots that I had to bandage before I started to look like Andy from the office running a marathon...Never going to wear that jersey again....