FIFO stock info using search functions and averaging data

[JonnyHazell]

Hi Guys,

I am currently using pivot tables to get our current cost of good prices for thousands of products via thousands of lines of data, so as you could imagine its very time consuming. I've been trying to come up with a way to automate it, but I'm coming up with blanks.

I'd like to be able to enter a customer name and product, and to use some excel magic to return me the average COG of the latest 1000 units purchased.

Here is a very basic example

Customer	Product	Invoiced	Qty	Amount
Steve	Eggs	02/08/2015	5	25
Steve	Sausage	02/08/2015	8	48
Steve	Sausage	02/07/2015	6	30
Steve	Sausage	02/06/2015	5	55
Paul	Eggs	02/08/2015	5	25
Paul	Eggs	02/07/2015	5	23
Wanted
Customer	Product
Steve	Sausage		10	58	5.8

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So I'd like to enter Steve and Sausage, and for excel to return me the most recent average of the cost of 10 units.

Is this possible or just a dream I need to wake up from and get on the daily slog?

Thanks for any input!
Jonny