When Quantum came out, the ship had Dynamic Dining on it where the entire Grande venue was formal every night (they even loaned and made men wear jackets if you didn't have one). The rotational dining came later and was short lived before RCI cancelled DD fleetwide.
When looking at the sold ones, the prices range from $35 to about $120.
Biker, who sold his Voyager block for $125 last October though prices over $100 are the exception now.
The confirmation of the purchase usually is sent to the email provided during the purchase - you can print out that confirmation email and give it to them.