Saw the offer when researching on TripAdvisor. I've posted a link to Things to do in New York as an example, as I couldn't find a direct link to the offer. It doesn't seem to be country-specific. Tours are from Viator, which we've used without issues in the past. To qualify, spend a minimum of $325, which is not that hard if holidaying with other people and over a few days.
Terms and Conditions:
This offer is only valid for new bookings on TripAdvisor and Viator websites, cannot be applied to existing bookings and can only be used for transactions of $325 AUD or more. This offer cannot be used for (a) Disney items, (b) phone bookings, (c) for gift certificate purchase, or (d) with any other promotion or discount. To apply the discount to your booking, you must enter the promotional code at checkout. Offer expires at 23:59 PM PST on 5 September 2016.
Does anyone have any experience booking these sites? Will it really be cheaper or do these sites jack up the prices anyway?