Costs £81.99 on Lego website so better than half price in Argos.
Sadly still over priced but at least it's a big box :-)
LEGO Atlantis Undersea Explorer. 388/2744 £19.99 (£39.99 Lego)
LEGO Atlantis Typhoon Turbo Sub. 388/1831 £9.99 (£14.69 Lego)
LEGO Atlantis Exploration HQ. 388/2737 £18.99 (£40.99 Lego)
Bought all 4 sets in my local store today and at time of reserving, stock readily available, though doubt this will be the case for long.
All items had decreased in price in the last 2 days according to sales assistant.