These are links to some pages where I have found Yashica screw-mount cameras or lenses to fit them in the past. They may not always be in stock when you look, but look around and check back in a few days if you don't see what you need. These are used so the stock fluctuates. Most of these pages are updated daily to weekly.

A suggestion: save this page to a local file, import the links into your bookmark file, and then do a "What's New" on them periodically.

I'm not affiliated with these companies, and most of them I haven't even done business with.   Caveat Emptor...
(If you have any really bad experiences with any of them write to me about it and I'll pull the link.)

Remember when looking at the listings that the 42mm screw mount goes by various names depending on the manufacturer.   The mount was used by Pentax, Yashica, Mamiya, Vivitar, Ricoh, Petri, Praktica, Fujica, Cosina, Zenit, Edixa and Chinon (as well as possibly others).   Yashica calls it a YS or Praktica mount.  Pentax calls it an M42 mount, Yashica fans usually called it a Pentax mount and it's also been called a Universal Screw Mount.   It's been called a few other things I'm sure, but in 26 years of owning at least one I've never had one fall off the camera (unlike bayonet mounts I've owned) or get cross-threaded.

There is a Leica screw mount and a Nikon screw mount but they aren't the same.   If it isn't listed as screw mount by one of the companies above or if it isn't a 42mm diameter it won't fit.

Shop around a little: you'll probably end up buying something you don't really need...     :-)

[January 28, 2008]
These are pretty old by now. There's a good chance some links below are dead.

Lenses:
Ritz Camera (Pentax screw mount lens page)
Studio City used lenses page
D' Antiques lenses page
Kenmore Camera "Pentax S mount" used lenses page: mixture of brands
Luebs & Son Photo
Todco: Pentax and other Screw Mount Cameras, Lenses and Accessories and Lenses [Screw Mount]
A&I Camera Classics Ltd.
All Seasons Camera Pentax/Universal Thread/K-mount page
Columbus Camera Group

Parts cameras:
Luebs & Son Photo
Pacific Rim Camera
Brooklyn Camera Exchange Bargains (as is)

Batteries:
Yashica's Battery Charts page
A page of common battery dimensions
The photo battery page at Wholesale Advantage
Also photobattery.com
Try your local Radio Shack - the 2001 catalog lists many of the batteries these cameras use.

Tools:
Micro Tools (to quote their own page) "Micro-Tools Not only has the LARGEST selection of Camera Repair/Restoration Tools & Supplies but also has the BEST PRICES and we Guarantee It!"   Send for the catalog (124 pages) or download the PDF version (6.8 megs).   It's interesting and informative.

For small tools in general, also take a look at Micro-Mark

Ace Camera's list of used and collectible camera dealers with on-line inventory listings

Craig Camera has a collection of original and reprinted service info.

Manuals:
See Craig Camera where there are many manuals and reprints at $15-$18 each.

Added March 6 2008: A manual site with many HTML and PDF manuals for download, FREE: http://www.butkus.org/chinon/yashica.htm

Also, Yashica still apparently sells owner's manuals for many models.   To quote their page at http://www.yashica.com/support/mdf.html:

Camera instruction books/manuals are available through the Yashica US-East Service location listed above. They range in price from $4 USD for pamphlets to $7 USD for manuals. On some models only photocopies are available.

To order call (800) 526-0266 ext 4361 from 8AM to 5PM EST, or you may fax your request to 732-563-0614. You may also e-mail your request to cameraparts@kyocera.com

The US East Service location is at:

Yashica Service Dept
2301-200 Cottontail Ln.
Somerset, NJ 08873
(800) 526-0266

This is according to their Manual Finder page last revised 4/05/99.

Any information you think should be here is welcome.   Please email me.