Keep checking ebay. I have one and they come up for sale fairly often. I would just buy another and keep the one you have for parts.

along with a lens board you will also need the Vivitar negative carriers. they have been harder to find than lens boards.

My vivitar was my first enlarger but it is not my favorite. Instead of dumping a lot into it I would buy a Besseler or Omega.
Many around and easy to find accessories.