Just to save everyone the trouble of unsubscribing from zulily emails. No Lego sets are more than 20% off, some Lego clothes are though, which is why it says "up to 70% off" at the top of the page. Many sets are listed above RRP before the price cut as they include a random CMF bag to make it a "lot" deal. None of the sets that were already sold out seem to have been over 20% off either, so you didn't miss anything.
This has been a public service announcement