Just wanting to clarify this after having a 'nice' conversation with one of the senior staffers at Kmart Sunnybank (who was VERY rude, if you didn't get the sarcasm above).

The 20% off only applies to Transformers items NOT in the catalogue sale.
So for 2 weeks, several items are discounted as quoted in the catalogue, and for the first week, the rest of the Transformers toys are 20% off.
Because the catalogue items are excempt from the 20%-off, they are apparently not going to put up any shelf tags or promote it visually (because they would then have to give 20% off the sale items as well).

Not sure how the price-matching thing affects this, because their computers only seem to recognise the '20% off' the non-catalogue items (when I scanned in a number of items).

You *could* claim that there is 20% off Transformers, but without any visual proof (it isn't in the catalogue, and they apparently aren't going to put up any shelf tags), you may end up only getting 20% off the items that their computer recognises as non-catalogue items.