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You need to signup to see, but SportPursuit have some (some in certain sizes, some in all - std SP offerings) of the Bridgedale waterproof socks on offer for big discounts.
Image from app:

been using some for a while, and def a step up in terms of comfort from Sealskins.
Looked, but they only had small left, so had a quick search.. £17.99 from Leisure lakes
Bridgedale StormSock HeavyWeight Waterproof Boot Socks Olive (leisurelakesbikes.com)
Depends on which sock version but small upto xl in some styles.
all sizes in:
Midweight ankle £14.99 and midweight tall.£19.99
midweight is pretty thick.
Good spot on the heavyweights from LL, they must be mega thick!