Disc Zones - Selling Linux distributions and other open source software on CDs and DVDs. Multipacks of operating systems are available as well as single discs. They also provide VMware appliances.
Edmunds Enterprises - Offers Linux distributions and applications on CD. Online ordering and links to resources.
Freeware2001 - Kernels and applications available for download or on CD.
The Linux Emporium - Distribution CDs, boxed sets, and books. Located in the UK.
The Linux Store - A U.K website shipping worldwide, selling all the main distributions in multi and single packs. Online ordering available.