Well, there's someone in Taiwan who makes it - the store is just called 黑蒜頭 or "Black Garlic". It's made from garlic grown in Yunlin County and it is delicious.
To get some, take the MRT to Xinhai station. Exit and look almost immediately to your right (slightly away from the road, down another small dead-end road). Alternately, follow the smell of sweet roasted garlic that permeates the air for several meters in every direction. There's a small shop with a can't-miss sign (you can even see it from the MRT train if you take it past Xinhai) that says "Black Garlic" in English and Chinese and has a picture of black garlic on it for good measure.
Don't live in Taipei? You can also call them at (02)2934-0535 or visit their website. Apparently they do deliver!
This shop also has black garlic wine, vinegar and other items - I feel like black garlic wine would be a wonderful thing to cook with and I will eventually go back for some.
You can use it in a lot of different ways - it seems like it'd be really good in Italian, French or Spanish foods, and also work well in Chinese food (imagine a sauteed whole chicken rubbed down with the stuff, which also flavored the broth at the bottom of the pan, or on a fish that could handle its flavor). It seems to go especially well with vegetables, tomatoes, chicken and cheese. I think it'd be delicious as a lamb chop rub or with stuffed mushrooms.
But black garlic doesn't come cheap. One large bulb is NT100, a pack of 6 small bulbs is NT250, and a large pack is NT600. If you wanted to experiment with this ingredient or just eat it (it's delicious eaten straight), an NT100 bulb will do just fine.
Make sure you pick up a copy of their brochure for this little gem. Then stroll to victory with your black garlic!
Little additional note: If you take that main road to the right for a few minutes' walk you'll also come to Mr. Lin, who makes old-school tatami mats that are far higher quality than the ones sold at B&Q. He is the only guy I can find left in Taipei who still does this.
