Tasks of the bot:
Take several links to products on Amazon ==> check their availability ===> if the item(s) in stock - send message to TG chat with product name and link.
The same for out of stock.
Update frequency - as often as possible without triggering Amazon.
The bot must use affiliate links with the given Amazon affiliate tracking id.
This kind of bots has an open-source code on GitHub, etc., so it's a simple task for an average developer.
The lowest bidder gets the job.