For cheapness there’s the £10 ones from B&Q or Homebase – I’d rate the B&Q ones as a wee bit comfier though at that price neither are super durable I suppose (though depends how much you use them).
I was always skeptical about wellies (not had a pair since being a kid) but got a B&Q pair last October for a training course then when the snow came at the end of November they pretty much got worn everyday. Lasted 6 months, when they split at the side where the toes flex and a couple of teeny splits in the sole. Consequently got wet feet. Got a Homebase pair just after, that are doing the job down the beach, in the woods and will get well used when (hopefully) the snow and chaos comes again or even just round the wintery wet gritted streets with the dog! Not quite as comfy as the B&Q ones, but still fine for me. I get them slightly bigger sized – try them on in the shop with normal socks + thick, warm socks so they’ll be fine and toasty when needed.
Might be a bit too much info there, but you know what, I love my wellies!
EDIT: those superlites look nifty