Not sure if 30% off code EGGS works as well https://www.hotukdeals.com/vouchers/up-to-30-off-groupon-until-monday-3218026
The problem with these is it comes with an Activator which has a limited amount of uses - though I think there's a way around it (avoided using the word "hack"). I bought a few Photon Masks (the ones that change colour and have a timer unit) for a fiver each from Amazon Warehouse! Haven't used mine yet. Though I have used an Anti-Aging Lightstim for years and years.
£26.28 @ Groupon code WELCOME. 5% Quidco