Here in Australia if you want to shoot Kodachrome you need to buy it direct from America and then mail it to Dwayne's. That's postage here, postage there, then postage back here again. Plus the exchange rate isn't favorable by any means.
If you can shoot Kodachrome and drop just it in at Wal-Mart, please take advantage of it, it cant get much simpler (or cheaper) than that.