the first method is by using PLR product that is related to the product launch.get a PLR product.turn that ebook into video course and also audion.you could provide transcript of the audio if you want to add value.give a nice name to your bonus product and get a new graphics done.

if you're not confidence in making videos practise it.every time i record new videos i am getting better at it.of course for the first time you would feel awkward as though you're talking to yourself.get used to it.or prepare a script so that you don't forget whatever you wanted to say in the video.but don't sound like a robot.keep it natural.

2nd is offer to do webinar and then provide rights to it which people can use it to sell or build their list.this method is being used by mark ling and it worked very well.

3rd is by asking the product owner whether he could provide any of his previous paid product as bonuses.sometimes it might be hard for high price items or if they don't know you well.but most often they agree.

always make sure your bonus product is unique if you are using your bonuses.people don't want some crappy master resale rights product which they could find for a few cents.