do a roaring trade in a sentence

1. There are plenty of fringe projects that do a roaring trade.
2. They do a roaring trade, but are closed down by the Irish authorities.
3. Pirates bring in their booty to be sold to the black market, northern traders frequent the place as a rest stop on their way to the aforementioned Ten Towns during the warmer months, ready to buy exotic scrimshander ornaments, several taverns do a roaring trade in ale and other spirits, the drugs and slave trade are rife ( although obviously sublimated ) and information brokers and prostitutes ply their trade during the night-time.
4. It's difficult to find do a roaring trade in a sentence.