With orders of $25 or more, Amazon offers the Lodge 3.5" Miniature Cast-Iron Skillet for $4.19 with free shipping. (Target has it for the same price via pickup.) That's the lowest total price we could find now by $2. It's 2" deep and features two pouring lips.

Note that this item is part of Amazon's "Add-on program"; it can only be purchased with an order of $25 or more.

Update: The price has increased to $4.48. It drops to $4.23 at checkout.