I want an xyz, should I get it from you or a store?

You can get it from a store, if you know what you want.
     And if they have it in stock, or if you go to several stores.

You can get it from a store, if you don't know what you want.
     They will sell you something.

You can get it from a store, if you don't care what you get.
     They will sell you whatever makes the most profit.

You can get it from a store, if you don't want to know your options.
     They will sell you anything.

You can buy from a store, if you don't want to decide on an option.
     Just take one from the shelf to the cashier.

You can buy from a store, if you have extra time to drive around.
     Or we can decide now.

You can get it from a store, if you want to pay more.
     Wal-mart was the only place in town last week that had a specific
     memory module -- at three times my cost.  Computer shops know specs 
     improve and prices drop every month, so they stock select items.  

You can buy from a store, if you consider yourself a consumer.
     Shop till you drop.

You can buy from a store, for sociopsychological reasons.
     All of the above.

You can buy from a store, if you just want to spend money but not think.
     Are you asking this question to avoid thinking of the obvious answer?

Or I can get the right product at the best price and make sure it works.