go to michael's or jo'ann fabrics... or some fabric store. thats what i did when i had all my reptile tanks up. just get the suction cups and attach them to the glass. thats what i did for my fish tanks to. its alot cheaper then going to the pet store and paying $15 for one vine. $10 did my 55 gallon tank.
The craft stores usually have some sort of metal wire in the base "roots" of the plants to make them bendable. I have used them in reptile cages and they work great but I would make sure they are not going to be around any major sources of water due to the possibility of rust.