Yes, the total value of the products you would like to destroy has to be under $800 USD. And you need to be able to provide me original invoice number or PO number.
Regards to what products to pick from, I suggest we divide $800USD to $200 USD per quarter, so every quarter you can get new products. Or we can do $400 now, and $400 in summer 2015, so for the first $400 USD worth of products you can pick from the new products from Sep 2014. I think this might be a better way, so you can get some new products for review, and also expand the products that you keep in stock. The free products will be sent with your regular order, and you are responsible for the shipping cost.