While looking for something else, I found the ad for the aforementioned harp rack:

Blues Tools
P O Box 4045-A
Oak Park, Il. 60303-4045
(312) 409-7771

In the July,'96 edition of Acoustic Guitar, it is listed as $60 + $5 (S/H), so it's probably a few $ more, now. (I bought mine about 5 years ago at a NAMM show, and I think they'd just been introduced...as I recall, I gave $40-45 for it, and still love it.)