I had some weapons and mining beams drop today. The first time I pressed j, I got a station and a price. After that, pressing j brings up a N/A value. This occurred when I entered a new system with the goods as well.

Didn't bother to check trade items.

NA means it's not available. Give it a minute or 2 and try again.

Fair enough. Like I said, I get sell info the first time. If I exit the screen and re enter it, I get the N/A value. I still haven't noticed the issue with normal trade items. Since I've gotten the info, its not a problem for me. I just thought I should mention it.