Craigslist and probably ebay too
There is at least one place online that buys and sells tattoo equipment. The link is provided below -
Yes, tractor dealerships sometimes sell used construction equipment
Play it again sports! You can buy used (so you don't spend as much) and sell used equipment there.
Cheap tattoo stickers are also a good way. Please consult FashionTIY online wholesale market for details.
You can sell used weight training equipment on Craigslist. You can also auction it off on eBay.
Simplefit.com, ippe.net, and craigslist.org are websites you can sell used equipment on. EBay is another great resource for selling used weight lifting equipment items.
A4 hectograph spirit paper are used for tattoo stencils. These are sold at Magnum Tattoo Supplies as well as other tattoo shops.
Green Soap, you can purchase it through any tattoo equipment supplier. I find that it works well when used in a squirt bottle, although some apply it with a spray bottle. (also available at equipment suppliers).
Tattoo artists are licensed by the state in which they work. Requirements include proper care and sterilization of equipment to meet and exceed health and safety standards. Some equipment is disposable and other types are re-used after sterilization. Talk to the tattoo artist about his/her procedures and policies. All are happy to discuss details.
When you let a unlicensed tattoo artist tattoo you, you have a greater chance of a botched tattoo, and of becoming infected from improperly handled tattooing equipment
Enterprise equipment manufacturers sell facsimile equipment
Enterprise equipment manufacturers sell videoconferencing equipment