I live very very close to this distributorship and on 3 (yes, that's three) occasions the owners (once the dad and twice the son) have charged an additional $1 to the said price. The last time, I did it totally as a ""R&D project"". Basically, the owners hope you're not paying attention to them ringing up the price of your purchase and tack on an additional $1 (or more, but has only been a $1 on my 3 occasions).
Pros: they have beer
Cons: they charge extra for the products without letting the customer know.
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