Free: Contests & Raffles.
Carry a spare tube, couple of patches, c02 pump, tire tool, spare c02 cartridge and a hand pump. All fits in a small seat bag except the pump. Should be able to fix a flat in about 10 minutes. I only use the hand pump if I run out of c02.Make sure you check the tire and remove whatever gave you the flat or you will have another pretty quick.
You might consider putting some liners in the tire to protect the tube from stickers and such.Feel your pain! Blew out a tire about 7 miles in at dusk one year elk hunting. Didn't get to thecar until 10:00. What really made me mad is I wasted all that good downhill coasting coming out.