Farmville now offers the Carnival Tent under the building section in the Farmville market. This is a available for a limited time only. It cost 12,000 coins and can be sell for 600 coins, it will give you 120 xp.

As of this writing, it will be available in the market for 11 days more. This is good for decorating your farm and also as a collection, because it might not be available in the market again…forever!