Ebay is your friend on this count.
The other possibility is that you just have some grit in the hub. I'd look into riding your spare bike ( You DO have a spare bike for situations such as this don't you?) back to REI and invest in a cone wrench or two and do a strip down, clean, regrease and reassemble LONG before I'd just jump into a new wheel right off. And while you're at it ride around to a bearing supply house and pick up a bag of 100 each of 3/16 and 1/4 inch grade 25 balls. You can easily get away with grade 100 but for the pennys more for grade 25 you may as well splurge. It's wise for the cost of less than a buck to just swap the balls each time you strip the hub for cleaning and re-greasing.
Once it's apart and the cups and cones are spotlessly clean study them. If they are truly damaged you'll see divots, pits or obvious signs of trouble. If they are even and there's just one slightly more shiney line of even width running around the cup and cone and you can't feel it as a ditch with your fingernail then you're fine and can go ahead and pack 'em with grease and new balls and be good to go for another year.