Not the answer you are looking for, but check valve stem first. Also if you can change a tire you can fix a leak.
It may have a something in it causing it to leak.
If you know what you are doing and dont care that your nice rims may get damaged by fixing it yourself.
If you damage your rims using a plug kit, you probably can't change a tire.
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Just remember to mention it the next time you go in for new tires. The guy taking the old tire off the rim will appreciate the heads up.
Hopefully it is just a leaky tire. Last time I had a "leaky tire" it was actually a cracked rim.
big o tire in ankeny.It isn't that expensive, so I'd go wherever is convenient for you.