I usually buy gallon wine for 9.50 us dollars, drink the wine, and keep the carboy. So far, it has taken me a month to drink 3 gallons of wine, so I figure you got a great deal, less damage on your liver.
Check though I got 4 1 gal carboys that my autoshipon dosnt fit into I had to buy a racking cane so I can use them. It was the old 1 gal bottles that coke syrup came in.