Where can one find expired domains or ones that are about to expire?
Do I have to pay for such a service or is it free?

snapnames.com
and many other expired domains sites like deleteddomains.com i think
But the best ones arent free to use.

that oddity software site that was posted here also contains a huge list
i dont think they reserve them for you but they have the list.

You might just have to search for them using se's or you can search for sites that list them. I wouldn't pay anything to join a site though. There could be other sites that are free and offer more.

You can find some expired domain names on Ebay. I'm not sure if you want to go that route, but I have seen some on there. Of course you can also do a search for them and find the companies that list them.

I knew Ebay sold everything under the sun, but that is truly a new one for me. How does that even work out?

recycled-traffic.com offers lists for a $6.95 registration fee. There are tons of free sites. I guess with this service, you pay because they show sites that have proven traffic. They say you can test it out for free too. They also claim to show sites that other search engines do not.

What they give back after spending monet on them ? Only domain names available or full access to them?