I looked into using a PO for the Circuit Playgound purchase. I found some information that might be helpful.
We accept Purchase Orders from educational institutions in the United States placing orders of $200 or more.
We do not accept purchase orders less than $50 and for purchase orders less than $200 there is a $20 processing fee.
We do not accept purchase orders from customers outside of the United States.
To place a purchase order, please create a quote using the wishlist tool. This quote can be saved as a PDF and used by your institution to create an official purchase order. Once you have an official purchase order, please move the items in your wishlist to your cart and proceed to checkout, selecting “Purchase Order” paid via “Check” as the payment option. After you place your order online, please send your official purchase order along with your order number to email@example.com
For more details on making a purchase order, checkout our Customer support video: https://www.youtube.com/watch?v=AGcxayYiaVM and guide http://adafru.it/dB6
Hope this is helpful!