Jay changes what she stocks every 6 minutes, like most of the shopkeepers. Also... When you have extras of stuff you can also donate them to Lycus (University-lab NPC Lycus); anything there is free for people to take (at a 1/minute rate) and things that have been there for 24 hours without getting claimed get used by Lycus to fuel his experiments. You can see the progress bar for the current experiment right above the donation items. When it's full, we get a cool new exclusive item! Well, it shows up in the lab there to take for free for 24 hours, you can get as many as you want in that time, and after that he doesn't stock it anymore but you can get it for Gems from Headmaster Nick. So it's an easy way to dispose of extra things if no one buys it and it's not useful for a quest or your kith.

Yeah true

Thanks for the trade, i forgot to say!