Add "TCGPlayer Only Price" and "eBay Only Price" as columns in the API/CSV

In many cases, a TCG Player listing might be $0.10 + $0.99 shipping, while the eBay listing is $1.09 + free shipping.

The current price formula would mix sales from these listings together, creating an artificial price bump, even though the card is effectively the same price on both sites.

I want to be able to remove eBay from the equation in your CSV to reduce this type of contamination in my tool.