What @Hogrider said. If someone says they can do it "cheap," run a mile. Quality tattoos aren't cheap. Also, not every tattoo artist will be comfortable tattooing scar tissue. Check around and ask a lot of questions if you find someone.
Really wanted to check the photos but it's not available anymore! That's a pity - I'm thinking of holding a similar party in California this fall and I have a couple of crazy ideas connected to banners and stickers. I already found a good printing company: https://urbansignandprint.com/ Hope everything will go in order!