Fix a flat can, to get tire lifted off the ground. $7. Saves 45 min as opposed to change a tire when it works. Might not fully inflate the tire but lifts it up high enough to drive to gas station perhaps.
It does what it says. Inflated a tire to 30psi within 6min, powered from the accessory port. $30
If you want the tire fully inflated all the way, before you get underway to a tire shop.
Combined w above, if the leak is real bad, you can roll the tire until you see the fix-a-flat fluid starts leaking out, to see where the leak is.