There were just over 100,000 TR-1 radios made in total. Grey, ivory, red and black were the
most common (and still most commonly found)
The jade green and mahogany cabinets were introduced later in the production. Even rarer
are the pearlescent blue and pink cabinets.
I doubt if any one knows exact numbers but they are not big.
It won't be impossible to find what you need but it might take some patience.
In the past year I believe I've seen two or three jade green TR-1's on Ebay.
It's amazing to see how many TR-1's show up every month on Ebay. My guess is that they
are not as "rare" as once thought. People must have held onto them as a keepsake with the
knowledge of their historic value.
Here's some great infohttp://www.mequonsteve.com/regency/