How should I insert a coupon in my brochures?

[Hillary Mezzacasa]

I do the advertising for a business and we made brochures. For an event, they want to insert some sort of coupon. I was trying to see what would the best way to do so. Should I make a sheet and just put it in the inside of the brochure? Or make a coupon the size of a business card and use something to stick it to the inside of the brochure? I thought about doing that and using the sticky clear goop type stuff to stick it in there but am not even sure where I could purchase that?