Sounds like you have your sights set on a 2310 or a 2510, so the next step would be to watch the "For Sale" section here, as well as THT and any of your local fishing or boating boards.
Your profile doesn't show where you are located, but if you are in the Chesapeake region, take a look at the "For Sale" section of Tidalfish
http://www.tidalfish.com/classifieds/vi ... p?catID=11
Another option is to talk to your local Parker dealer. Many times the sales staff will know of pending deals where trade-in's are involved, even though the boat hasn't shown up on their lot yet. :wink:
Even if the dealer doesn't have what you're looking for in their queue, let them know you are interested, and when one comes available you'll be the first in line.
In my area, it is not uncommon for Parkers to be sold even before a 'For Sale' ad hits the printer. Make your contacts, put out feelers, and eventually you'll be successful.
Word-of-mouth is how I scored my Parker.
Good luck!