Was adding items to my bazaar and noticed I had too many items so I went and deleted 2 stacks before hitting add. There were 9950 items or something and when I clicked Add, several items threw the $0 item error. When I clicked Cancel all items showed a value in the item add selection screen. But when I clicked Add again they still threw an error. Clearing the listing and re-adding did not fix the issue, I had to refresh the item add selection page entirely to fix the issue.
The $0 error:
The item add selecting screen looked completely normal, with prices filled out for every item shown 🤷♀️ After reloading the page the items added just fine, all prices were maintained from previous adds and I didn't have to change anything from $0.
I do remember that I may have accidentally hit the Clear All button after selecting all of the items in question and then continued adding. The items added after hitting Clear All didn't throw the error. Just realized this.