I highly doubt he'll allow SQL calls over the internet. I know game collector does pull values from there, but think over pure http; I don't have anything that can do wireshark of that at the moment, kind of inbetween network setups right now. Not sure if they have an API for it, or what. But since most of their good stuff is subscription based, I doubt it's free, so you'd almost have to scrape the website.
Also if you didn't know, pricecharting is also owned by same guy who owns jj games.