Best Alternative To Mason Jars?

After reading a number of threads on this forum regarding the storage of pipe tobacco, it appears the absolute best way to do so is with mason jars. However, mason jars are not available where I live in Asia. What, in your opinion, is the next best alternative to storing pipe tobacco? I smoke about 3 bowls a week, so the tobacco will be around for a while.
Here's what I'm doing now: Most of my tobacco is in round or square tins. Currently I have one open tin of Old Dublin wrapped in a ziploc, then stored in the best airtight container I could find (has snap down lids, but still not sure if its keeping all the air out). I thought about taking the tobacco out of the tin, putting in a ziploc, and then putting the ziploc in the container. But I noticed the lid of the tin somewhat threaded so I kept it in the tin.
As far as weather goes, it's pretty humid during this time of the year, but it will begin to cool down to the 40s and 50s by about November and the air will become a bit drier. There is very little Spring, so it will heat up again by March--by May, the heat and humidity are intolerable, with daytime highs reaching up to 115 degrees.

Many thanks Roth, and I agree with dragonslayer 100 percent--you are always willing to go the extra mile for the members here--I will definitely check those stores the next time I get to Thailand.
As for shipping, yes, of course I can have a relative ship the jars to me, but it's fairly cost prohibitive. Shipping glass jars to where I am costs around $60.00 and, import duties will add another $50.00. So, add the $11.00 for the jars and I'm looking at a total cost of $121.00.
However, I have tons of aluminum paper, wax paper, and saran wrap, so that might be the best alternative for now! It would have never occurred to me to try that, so I really appreciate the suggestion.

Sorry roth--thought I'd posted my location--I'm in Pakistan, but I don't work for Uncle Sam so no APO address. Internet searches and local shops have unfortunately been in vain. I've found online distributors, but they're located in China and then back to square one with import and duty fees.
Found some bail top jars locally but the seals were horrible.
May have to start asking around the expat community here to see if they can get them. Until then, perhaps aluminum foil/saran wrap/wax paper method may be the best alternative to mason jars.