Finding lowest cost price with multiple criteria

I have a number of suppliers who all supply the same product and manufacture the product in the same city. I want to be able to find the lowest cost for a specific product from a manufacturer in a specific city.

Here is a basic example of the table of information that i have:
Part Code Supplier Location Unit Cost
AAAA Factory 1 Xiamen $5
AAAA Factory 2 Xiamen $10
AAAA Factory 3 Xiamen $15
AAAA Factory 4 Shenzhen $5
AAAA Factory 5 Shenzhen $10
AAAA Factory 6 Shenzhen $15

What formula must I use to find the lowest cost price for Part Code AAAA, in Xiamen?