The mics here are put together with great care, trying to maintain the highest standards I can find around. There are great mic builders and modifiers out there who have been gracious enough to share their techniques, and I listen hard to every one of them. I think you'll be happy with the products available here.
I sometimes sell on eBay as well. simplemics on eBay
Custom Harmonica Microphones
9 Basin Front Drive
Newbury, Massachusetts, USA