They do that for free
Les Schwab will fix flats for free and if they use plugs I've never had a problem
A plug is a cheap quick way to fix a tire but it's about the worse thing you can do to a tire. Over time sand will get into the plug and you'll have another leak. Plug can also make the tire unbalanced.
Usually fix for free. I wouldn't have them use a plug though, have them patch from the inside.
They fixed my tire for free.
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