want to uss most recently price paid for non-inventory items on purchase orders

Hi JC12, 

Thanks for posting and welcome to the Community Forum. 

I understand how important the prices are when we create purchase orders. Generally, if the item is not being inventoried the buying price and selling price are fixed. I would suggest opening the Inventory > Items List > Blue arrow next to item name > Buying details window, this gives all information about the default buying settings of a certain item. However, if you've used inventory for this item the default prices would run on stock price average. 

Also, I suggest you read through this article Creating items. This article will give you a lot of insights regarding how items work in the application. 

Let us know if you require any further assistance with this. We're happy to help. 

Cheers, 

Genreve