The little vials of scented oil are 3 bucks a piece.
I am probably going to suck it up and buy the flavors they want to try out, put some in a gel for overprint and some in the underlay and see what happens.
We had Patrick from Durascent up for a presentation a couple of years ago, fascinating stuff. Developing and deploying a scent can get really complicated though as everyone's interpretation and emotions connected to a smell can vary widely.
For example, to you the smell of rose perfume might mean a beautiful girlfriend you had once, to me it's my grandmother's dusty closet. A lot more involved than deciding where to put the puff or the HD. That is exactly what stopped us last time.