I was playing around with some LA Girl Glitter Addict polishes and thought I would try making a frankendupe of China Glaze Spellbound. I used Explosion (silver) and Flamboyant (orange). It's not exact and I only layered the polishes over each other. I think that if I mixed things together in a bottle it would look a bit better and possibly closer. Maybe. It would need some tweaking but it could be done.
Maybe this will help if you have the craving for Spellbound. You could make your own (better) version for cheap!