If you need to drive from SDQ to Las Terrenas on arrival, i wouldn't recommend stopping to shop for beach towels in Santo Domingo unless one of the shops at the airport has them. Of course they would be overpriced there, but the convenience may be worth it. You will definately be able to buy them in Las Terrenas, although price may not be the best there either, since it is a tourist area. Your trip should take you through Nagua, and at that point you will be only about an hour or so from LT, so if you are on schedule and think you have time to stop, I think you could get a better deal there, but I couldn't tell you the name of a store.
As far as booze is concerned, they sell it at the supermercados, and you should get a better price there than at the duty-free.
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