There hasn't been much out for a couple of years for the retrobird collector. Maisto is still carrying 3 color combinations in their 1:18th scale and a few vendors do keep them in stock.
Meanwhile, High Speed has produced one in 1/87th scale. It's been marketed under several brands, most recently by Malibu International who has given Walmart stores exclusive marketing for the model. It's labeled a 2003 and can be found in colors of black, red, bright turquoise (if you're a 1956 model fan, you'd call it Peacock Blue), silver, and now a dark blue.
I just visited Minichamps website and found that they'll be releasing a new color for their retrobird model (1/43 scale) sometime in December. Their website did not mention the color though.