I have some ideas for you. What you'd want to do is decide the size that you want to decant into. There the usual are: sample vial (2ml), 1/6oz (5ml), 1/3oz (10ml), 1/2oz (15ml), 1oz (30ml).
You can get those in either roll-ons, atomizers, and splash bottles. You can usually choose between plastic and glass decants. Most people prefer glass atomizers (as far as I know).
Usually, you would spray the juice into the decants. There will be some spillage though so, with tops that come off, it might be easier to aquire an eye dropper. It'll make the sampling selling easier too as they are just tiny vials.
Prices are set by others prices and by what you paid. Usually you take a little off the top for it being used already. After that you can devide it evenly into the appropriate amount for each decant based on the size of the bottle and the number of decants you made with it. I always have trouble with this and I would look at others to find a fair price to set mine at.
That is my advice.