The Horse Post is a decoration in FarmVille
The Horse Post was originally released as part of the Southwestern Event for 75,000 coins.
It was re-released on August 27th, 2010 as part of the Wild West Event and was available until September 8th, 2010 for 150,000 coins.
It was again re-released in 2011, as part of Zynga's RewardVille program. It was purchasable for 80 zCoins at zLevel 40.