"I hear that works better if you buy a ticket once in a while."
I once bought a backpack on 14th Street for $3.
It would not have been so different from how my grandfather once bought me.
He once bought one of his books back from the publisher.
So you buy once and install on all your computers.
Then the customer either buys once and never again, or he doesn't buy.
She remembered reading a western novel her husband had bought once.
My father once bought a house for us as a Christmas present.
Once bought, he did not "sell out," but held on to the paper.
He once bought a Porsche but returned it two weeks later, taking a $12,000 loss.