"I quote John Lennon: 'I don't believe in Beatles - I just believe in me.' A good point there. After all, he was the Walrus. I could be the Walrus - I'd still have to bum rides off of people."
I'd steer you away from plastic jars. Some varieties of food grade plastic produce a minute static charge, which tends to attract the resin glands, causing them to break off from your buds. Glass doesn't do this. Of course it's a miniscule amount of HC loss, but every little bit helps.
If you're in the Kansai, there a couple of shops in Shinsaibashi, Osaka. There's also an excellent shop with great selection under the train tracks in Kobe between Kobe and Motomachi Stations.
Depending on where you live in Japan outdoor guerilla gardening may be a safer and easier option. Hemp...