Have an older laptop lying around? It should be able to run Tiki Suite just fine. You can also purchase a ClearBOX or rent a dedicated server ("root") from any hosting provider.
In the future, we'd like to figure out a way to run on a http://en.wikipedia.org/wiki/Plug_computer
Please share below your experience of successes and failure with various hardware. In general, pretty much any laptop will work, if it has USB ports.
Standard Laptop + extra NIC
See:
http://www.clearfoundation.com/docs/howtos/usb_network_cards
http://www.clearfoundation.com/docs/howtos/clearos_on_a_laptop
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