I happen to know that when Amar returns from his drunken orgiastic spree in Edinburgh, he’ll be desperately seeking a Low E. It’s true. He will.
And come to think of it, I might be mooching around for one too, soon. So far though, I’ve only seen a Dixon in Low E. Anyone know of any others? And if you recommend them, why?
O’Riordan makes a low E. Loretto Reid thinks very highly of it. I don’t think I’ve had a chance to try one, but I love my low Eb and D, so I went ahead and ordered one on her recommendation.
My Burke composite low-E is one of the best whistles I’ve played. Of any key. It’s got a full somewhat woody sound. The low-whistle sound without the low-D reach. Very light and comfortable to play.
The usuals make E’s – Goldie/Overton and Susato come immediately to mind.
I have an aluminum low E that I’m mostly done building except for a workable tuning slide. (Shower curtain rod and hand-turned hardwood fipple plug, flat windway.) It can take quite a bit of air in the upper octave, and is my first attempt at a low anything. I cut it too short to make a D and didn’t realize Eb was the next useful key up at the time. 
E’s not a terribly common key, is it?
I need to borrow my brother-in-law’s digital camera since it has much better close-up focus than mine. Then I can post pics of my various whistle making attempts for everyone to laugh at. 
Hi Gary,
I have a low E Susato “Kildare” model. Which is not in the same league as
the ones mentioned, but is true to pitch and plays well. I put it up for sale
awhile ago but just didn’t really pursue it. ($50 plus postage). Its in fine
shape. It turned out that I only needed it for a few times and don’t use it
anymore. If you want it, let me know and I’ll find out what the postage is.
A picture of it is here http://www.thewhistleshop.com/catalog/whistles/inexpensive/susato/kildare/kildare.html
It is the 3rd from the left (3rd tallest) in the first photo on the page.
Lesl
According to the Overton website, Colin Goldie makes an E tenor.