The closest thing we have to Future off the supermarket shelf in Australia is Johnson''s Plegde One Go. It's not quite the same though and I believe it has some cleaning agents. It's also a translucent brown colour, unlike the original Future which is clear. (It does dry clear though). I have tried this as a clear gloss coat but didn't like the results. I do often use it as a clear parts dip though. Pledge One Go can easily be found at Coles in the floor cleaning products section.
The next nearest product is Pascoe's Long Life floor finish. This will attack acrylic finishes (such as Tamiya) so I sisn't bother trying it as a clear coat. Long Life can be found at Woolworths/Safeway.
There are a number of other possible options to be found at Bunnings which may be worth investigating - Feast Watson Floorshine (found in the paint section) and Peerless Jal Gemini (found in the cleaning products section). I haven't tried either of these, but both are described as water-based acrylic sealers.