Hi Amy,
Their catalog does not list their hours, however we have always been able to contact them during normal business hours (mon-fri: 9-5 pm). However, they often close for holidays and/or for their own reasons - so you might have found them at such a time. They also have an email - maybe they are reading that:
califsp@peoplepc.com. To make sure you have the right number: 510-527-6032 or 510-527-0729. (This is assuming they are still open for business - not that I have heard othewise but it has been at least six months since I've last ordered from them.)
dmv