It's possible that you are thinking of a specific line of Star Trek plates that Hamilton Collections may have discontinued. This could be due to several reasons:
* Low demand: If a particular design or collection wasn't selling well, they may have chosen to discontinue it.
* Licensing issues: They may have lost the license to produce certain Star Trek designs.
* Inventory clearance: They may have simply run out of inventory for a specific item and chose not to restock.
To find out about a specific plate you are looking for, you can try contacting Hamilton Collections directly or checking their website for current offerings.