GHA Discovery is running an August Member Exclusive Sale, which you can access here.
You need to book by 30 August, and the discount is up to 40% off. To be honest I don’t usually buy this sort of sales, as most of the time the actual saving is much less than what’s advertised, if any. That said, in GHA’s previous sales I did see some very genuine good rates.
For a September Saturday night stay at Corithia Malta St George’s Bay, the sale rate is €164.7:
Whereas the cheapest rate Trivago finds is £165:
Therefore if you do have plans to stay at a GHA hotel, make sure you check the Discovery site for any potential discount.