as much as I love it, the big name nail polishes. You can purchase magnetic polishes with "very similar" colours from Boots/Superdrug for £4.99/£5.99 a bottle, whereas they charge £11 for theirs. That's double the price!
Also the food, meat and chocolates that they sell - for example I have seen the same choccies in my local pound shop (small boxes I agree) but £1 is not £30-£40-£50 a set. And the meat, wahoo! if I wanted to spend £80+ on meat at christmas I would go to supermarkets etc for far lower prices and choose my own.