I bought a kit to do that my self, the rubber strip type. Save
me a lot of money since where I work is around a big construction
area, nails and screws are everywhere.
Due to safety reason, most tire shop wont patch a hole bigger than
1/4 inch and less than 1/2 inch from the side wall.
I did it anyway, just put liquid rubber sealant into the tire to
seal it from the inside. Works fine until today.
Regards,