I bought one a couple of years ago. It's one of those thin green ones that rotate (it might be an Olfa). Saw one for sale yesterday at Hobby Lobby for $42.99. WOW - I don't remember paying that much for it. I don't like it and have since converted a lazysusan and I like it so much more. It's similar to yours. They are great. Handy hubby you have.
Suggestion: If you have an IKEA close by check them for lazy susans. If you don't like round, glue a thin piece of square wood to the top (maybe 1/4 inch) to attach a small square cutting mat. I recycled an old mat that had cracked. Cut the good part to size and it fit perfectly. Used a Sharpie to mark the inches.