I don't know about right now, but when I bought mine, Audio Advisor had the best prices, although I think they were so low due to some sort of promotion. Cheers!
Go quickly to AudioAdvisor.com ... There is a Arch 5 demo pair for $129 as well as caster/wheels, extra shelf and cable management system. The rack itself is the standard version, don't know if you are looking for the higher up version. In whatever case, audioadvisor is a good place to get Salamander stuff.