Are they only in the shop a certain amount of time?

Also, more general of an inquiry - what does "not enough purchases" mean?

Typically they don't remove restockables from shops very often, no guarantee how long but they will be there for the foreseeable future- years if not forever haha.

"Not enough purchases" I think means the algorithm can't calculate an average price because there haven't been enough bought from shops yet. It needs a certain amount of data points to be accurate, and they're brand new so nobody has purchased them yet.

Because they're a new item they'll be quite sought after. You're going to have to be quick if you want to grab them, though I'm sure if you wait a bit they'll be relatively affordable soon in the user shops.

Not quite sure what you mean with your second question.

Official Price is the amount the item will cost in the main NPC shop when it restocks. Price Today and Overall Price are based on what an item is selling for in user shops... No one has sold any yet, thus the message "Not enough purchases."

Items released in the main restockable shops only get retired when users scream that those poor items have a unremoveable unrepantant qualia called "junk" and must must must be retired ...for some reason. It doesn't make any economic sense, but staff complies. This hasn't happened in a really long time. You will have time to get these.

It is my belief that certain items do have a stronger tendency to stock at certain times of a day. But not all of the same set of recolors, so users should be able to see them when they do restock in general. Once the crazy demand for them has had time to abate, you'll be able to grab them. Did you have any luck restocking anything from the Freyalise?

Price Today and Overall Price: these numbers are the same or so close to same that it's not worth noticing. This makes the Overall Price a garbage number. Don't pay attention to it as if it 'knows'. If you are interested in price trends, you can find this out via clicking the price of the item in the fansite Subetalodge. They will show once-a-month price for a year and daily for a week charts.