Cheap Dual Action Polisher for sale at SuperCheap Auto, available free via click and collect or $7 standard postage within Australia.
Just used this one over the weekend and it worked well for my first time.
- Powerful 600W motor delivers quick and easy results with minimal effort 
- 180mm diameter plate with a massive range of optional accessories available (sold separately) 
- Variable power settings with no-load speeds of 1500-6800RPM suitable for slower application of polis 
- Easy to install foam pad makes swapping between applications simple 
- Dual action design great for sanding and polishing applications 
- Horizontal 'D' handle for a sturdy grip with maximum control 

 
    





Don't think these are dual-action. It states it's multi-function, which doesn't necessarily mean dual-action. I have one of these, and it definitely doesn't oscillate the same way as dual-action polishers do.