My ama yesterday went well so I'm happy to talk about more stuff that I know about. While I can talk a decent amount about digital photography most of my experience is with film stuff. I have grown up in the digital era so I may not be as experienced as some of you older folks. I own a few soviet cameras, a chinese one and a couple old cannons. I've used a bit more than that so I should be able to answer a decent amount of your questions.
Yes ebay is great and is all I've ever used. I normally get stuff shipped from russia/ukraine. If you wanted to make sure you get a high quality one or even a new one lomography the website has what you're looking for.