I highly doubt anyone here would sell their Archives books. Most of us are avid collectors and aim to keep what we have rather then sell it. You'll most likely get suggestions to scope out EBay or possibly Amazon.com as well. They run fairly high regardless of where you go though, usually not too terribly much over $100 in some cases. If you're lucky you can get Archives II for a little under $80 but that's unlikely and rare. And that's just the second book, Archives I tends to run higher. A lot higher.
Good luck to you on your search though. I hope you are able to find them at a decent price.