Tempted to try an obscure varietal, but don't want to shell out $30 for a bottle you might not like? A handful of liquor stores and bars now allow you to help yourself to samples. It works like this: You put money on a debit card (or earn points on a card by buying a bottle of wine), insert the card into a slot, and push the button above the wine you want to taste. The Enomatic system dispenses an ounce into your glass and deducts the cost from the card. Prices range from $1 to $28, with most costing $2 to $3. In Texas, where self-service is illegal, wine jukeboxes (as the Enomatics are nicknamed) are operated by bartenders. Whether you push the button yourself or someone does it for you, the advantage is the same. Because the system hermetically seals bottles after each pour, some places are able to offer as many as a hundred wines by the glass. Cheers!