Sorry Film, been out a bit,
I do not know anything about that site. Yachtworld is a good choice, r just start going to your Catalina dealers and buy directly from them. If you get a list of the dealers and just start calling, I bet you can find a great deal. Lots of boat shows going on and these dealers typicalls do not like holding on to their trade-in boats for long at all. Most people buy a 250 not to trailer but because it is a good entry-level boat and will trade it up. Thus, you may be able to find some great deals. Since you are going to tow it anyways, I would just start scowering the countryside to find the best deal. Find one close to home, all the better.
There is the Catalina web site. Take a gander at the pictures. Any specific questions, write back or PM me.
Fair winds and good hunting...
PS When I say call the dealers, I mean for a used 250... not for a new one. New one is in the 30s.