try Krishnaculture.com their stuff inexpensive.

Get a copy of The Harmonium Handbook by Satyaki Kraig Brockschmidt.

It's a good overall owner's manual. Alot of harmoniums are in bad
shape and out of tune. I once got a portable model *on special*
from Mid-East (also got a great dulcimer on special) but it sat for
about 3 years until I discovered this book. I fixed the stuck keys,
the leaks in the reed-board, and tuned it to A=440, using a combination
of the masking tape and scraping method. One thing I read on the net,
and not in the book was that *over-scraping* a reed can cause it to lose
volume or go out of tune permanently. So I scraped first, to get it close,
then masking tape method. You just need a Chromatic tuner and time
and patience. Wish I had a strobo tuner. Used 2 penknives, one to hold
the reed and the other to scrape side to side.

Anyways, I've since sold it on Craigslist. The only problem I had was
adjusting the bellow's spring tension because they also helped pop-up
the keyboard/main part as part of it's fold-down for traveling.
But it was a decent harmonium.

Got another regular, basic harmonium on Craigslist last year
for $40, but it reminds me of my first one. Maybe I'll do a
youtube vid of inspecting and fixing it, if I ever get around to
actually working on it.

I also labeled the knobs (you'll know which is which after opening it up).
There's some pics of it here in the PHOTOS-Instruments section:

groups.yahoo.com/group/bhajanlearning/

Also a review of a learning DVD I got from krishnaculture
on that Yahoo list. Good for basic scales (start them
index, middle, then thumb) and exercises.