You can still find a great array of available small gauge equipment: projectors, viewers, splicing tape, reels, leader, and even cameras. The main resource we found is Ebay.com (depending on the country you live in, Ebay may have a localized site). There you can find an abundance of equipment. Just be sure to ask the sellers about working condition. In addition, below are links to other organizations that sell small gauge equipment.
AMIA Supplier Directory
You can view this online or download the pdf. This recently published resource from the Association of Moving Image Archivists is an excellent guide.
AMIA Supplier Directory: A Global Directory of Services and Suppliers of Audiovisual Media
Larry Urbanski has been in the business for quite some time and is well respected in the field of moving image preservation.