Puncture in tire on way home

[TheGodfather]

I was nearing the end of my 250km journey from Lethbridge to Calgary, when my TPMS light flicked on.

To my surprise, when the TPMS warning came on I was less than 3km from my BMW dealership. I thought what a lucky break...until I tried opening the front door of the dealer, only to realize it would be closed for good Friday.

Thank goodness for the TPMS, and thank goodness this didn't happen in the middle of no where (where the majority of the drive took place)

Anyhow, the rear drivers tire has been punctured with what looks to be a nail with no head. It was leaking so fast you could hear the air escaping. With the dealer closed and the time approaching closing for most auto garages I was SOL.

My X is parked in the parking lot of the BMW dealership. I drove back 3hrs later to jack up the car so that all that weight wasn't bearing down on the single flat tire. After doing some googling (as usual when trouble strikes) I figured this would be a good idea to avoid damage to the tire or rim.

For anyone wondering, the 17" spare would be no good as it is slightly smaller than the rest of the wheels, and I still had 50km or so to get home, also I didnt have the F@#*ing wheel lock key

MY question: Do the dealerships repair tires? If yes, are they going to charge me an hour of labor to do it? I would rather not pay $140 for something that costs 20.