First of all the dilithium mines on Rura Penthe will supply all you need and the miners are all slaves so they can pass the savings on to you...the consumer. (There....I used ST and Firefly references )
Secondly ...You don’t STORE antimatter. You manufacture it by taking matter particles and teleporting it via Quantum Entanglement and reversing the electrons to positrons during the process directly into a rocket nozzle where a gaseous matter is being pumped.
Oh, you’re talking about the Quantum engine. I was referring to the standard Warp Drive, which used a magnetic “bottle” to transport the antimatter to the reaction chamber where it was annihilated by the matter. The dilithium crystals are just valves that regulate the rate and direction of flow.
In either case, an antimatter drive is far, far away beyond my budget, which is limited to about three-fiddy.