So I used the magical search button and came up with some ideas on what would work, but let me give my specifics: I am looking for a oil catridge similar to what Heavy Hitters produces: I want something that is small and discreet, but can be refilled with my own shatter or wax. These heavy hitters run about $85/g medically in AZ. Its definitley the best catridge I've ever had, but knowing you can get them in CA for around $50 hurts me. I also get some fire wax for around 40/g. Anyways, I am going to coachella and need something discreet that can hold a decent amount and can be refilled. I thought the V2 Catridge Gentlemens brand didn't look to bad, but I was worried how well it worked, was it harsh, smooth, leaked, etc. These heavy hitters I could refill. I am almost certain if I got a syringe and a hot plate I could heat the my wax up enough to liquefy it and refill the cartridge, but again looking for overall effectiveness and quality.