Just in case anyone is interested, Humble Bundle has a Tad Williams bundle containing 21 ebooks for $18. The offer ends in about 1.5 days. The ebooks come through kobo.com so you would require an account with kobo to redeem the ebooks.
Kobo is an eBook store with their own eReaders, like Amazon Kindle or Barnes and Noble Nook. You can use Kobo with one of their devices, or you can use an app on your phone or tablet. Like Amazon and Barnes and Noble though, they want you to only read the books through their apps or devices.
My opinion on Kobo is that it's pretty good. They do daily deals where they massively discount books for 24 hours. I've gotten some good deals out of it.
I have a Kobo e-reader so I can't say if these books are DRM free or not. I'm not sure when HumbleBundle started doing this but this isn't the first book bundle they've done through Kobo.