Editing to add: Even if Magcloud doesn't have a way to do this, it might be worth your while (especially for cash flow!) to use something else like Paypal, buy them in bulk from Magcloud at a discount and send them out yourself. You could require a 1-year subscription to make it more worth your effort (and the bulk purchasing might mean you make more money on the sale of the magazine itself)
2nd edit: Thinking about this some more, the magazine is 40 pages long (yay!) but at $.20/page you're making only $1/sale in gross margins (boo!). If you were able to accept yearly subscriptions and fulfill from the US (I know you're in Malaysia) you could boost gross margins to $3/sale, in addition to the cash flow benefits. You would be adding fulfillment costs, but it might be worthwhile...
AND you could ship internationally if you wanted! :)