If its <$100 I'd allow 2 weeks. Note however that the postage will add up. Looking at my recent bills buying under $100USd means the postage is a big % of the final bill. So I am going to go for just under $300US per order so its under $00NZ and be prepared to wait for the parts (in which case 4~6weeks).
There is one on TM dunno if it would suit you, its Gunworks selling it, so should be OK,
AR15 .750" low profile Gas Block | Trade Me
Ask them if they can drill it to make it adjustable?
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