Reviews of ‘Ferry Only’ Whiskies

Possibly not the first thing that comes to mind early on a Thursday morning but I’m getting a P&O ferry back to the UK later. I don’t drink a huge amount of whisky but I like to have a couple of bottles in at home for choice. The two I had at home (an Islay and a Jura) were bought on a ferry in 2021 but I finished one just before Xmas and there’ not much left in the other so I’m looking to pick up a couple on the way back.
Ideally I’d like them to be:

• two different styles
• delicious
• bargains (although cost actually that important – if I’m going to take three years to drink them, I’m soon going to forget whether or not I spent an extra tenner)

I know a lot of the whiskies are ‘duty free’ specials making it difficult to compare vs. high street whisky (it’s almost like they do that deliberately). Does anyone know if there are any review sites specifically for duty free specials? Or does anyone have any specific recommendations?