First have you seen a CI teardrop? If not, contact Cary for the closest unit to you, you might be able to arrange a look.
I have purchased two used 550's. One site unseen, second I had seen when they mentioned it was going to be for sale. Both times I traveled over 500 miles one way, the owners meet me half way. Third CI is new and not for sale!
As for buying used, a 560 will be offered for sale, with and without the options you desire. Be prepared to travel a long distance. As for a "good price", what does that mean to you?
THe lower the price, the older the unit. Newer units hold 80-90 % of new units. Sometimes a unit will come for sale direct from the factory because the intended owner is unable to purchase then. Those units are essentially priced the same as a custom order.
To summarize, a used 560 will be offered for sale, be prepared to travel a great distance. Determine what price point fits in your budget.
Good luck,
Jean