Not gonna happen. The under $30k part is a serious deal breaker, especially for a trimaran that is over 30' LOA and good for two people to live aboard.
The older Piver and Jim Brown designs might work, but I doubt you're going to find a seaworthy one for that price. Another possibility, but a bit small IMHO, is a Telstar 8m or Telstar 26--however, I don't think that two people could liveaboard one, and I own a Telstar 28... so I have a pretty good idea of what I'm speaking about.
I'd point out that buying a boat in decent shape and spending the extra money to get one in decent shape is generally less expensive than buying the same boat as a fixer-upper and refurbishing it. This is especially true if you do not have the skills to do most, if not all of the work yourself.
I'd point out that there are some serious differences in sailing a multihull versus sailing a monohull and would highly suggest you get at least three books to start with, to give you an idea of what you're getting yourself into.
Chris White's The Cruising Multihull. While this book is a bit dated, the information in it still applies. It has a pretty good description of what the various pros and cons of cruising on a multihull are.
Mike McMullen's Multihull Seamanship. This book really goes into the handling and management of multihulls, including heavy weather tactics and how they can differ from monohulls. However, it is out of print, so I'd recommend try Alibris.com for it.
Thomas Firth Jones' Multihull Voyaging. It discusses cruising on small multihulls.
I'd also recommend you read the Multihulls in a Nutshell article I wrote. You can read it HERE