The Merchant, which is available at level 5, sells valuable items and offers great deals that are very useful on your farm. To get special Daily Deals, tap on the Merchant building. 
There are two tabs to choose from: Deals and Market.
Tap on the Deals tab to view the Animals and Resources that are on offer.
Tap on the Market tab to view the Crops and Goods that you can purchase.
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FarmVille Game GUIDE