I am looking for a company that offers a solution to integrate product alerts to an ecommerce site. Customers can signed to recive alerts via RSS, or email, or other options. I heard of mybuys but I am looking for other options.
If you sort your inventory by most recently added, a RSS feed seems easy to accomplish. If you have your inventory in a database, many database systems also offer a meta field that will store "last modified" date. If your current platform offers modules, see if the features you want is already available.
I would recommend trying to find a local company to help you with this, or use one of the online freelance auction services.
An RSS feed is a good idea but there is still such a large percentage of Internet users that are not aware of it or what to do with it. I would recommend doing both, at least you keep the web savvy and not so savvy happy!