I think it could be great with a max amount to buy or a stock amount...
Example:
4 is possible to buy, whenever someone buy those 4 items, the item icon will be remove and replaced with another item that you can buy/sell.
Then after 24 hours, it can show up again.
If I understand what you want correctly, you can already achieve that with the stock option, which can be individual or global, I encourage you to read the wiki to check all the features available
I think it could be great with a max amount to buy or a stock amount...
Example: 4 is possible to buy, whenever someone buy those 4 items, the item icon will be remove and replaced with another item that you can buy/sell. Then after 24 hours, it can show up again.