Groupon still exists, but I don't think it's as big as it once was. There was a Costco deal through Groupon a few months ago, and that's how I learned Groupon was still going.
Larrabee recommended all the sites I would have: moneysavingexpert.com for consumer advice, Rightmove and Zoopla for housing, Amazon are evil but soooo convenient (I still buy from them, but I hate myself for doing it).
eBay are good for finding bargains and generally quick turnaround. To avoid import duty, I limit my searches to EU only. If I don't care when it gets here and next year is fine as long as it arrives and it's cheap, I'll even buy things from Hong Kong (they come by container ship when it's convenient for the seller, which can sometimes mean 2 months later, but usually 4 to 6 weeks).
We don't own a TV and only watch streaming or replay services like Netflix, Amazon Prime, Channel4 on demand, etc. We stopped watching BBC iPlayer when they (rightly) made that subject to TV license, but we are still able to find enough to watch between the streaming services and Youtube that we never get bored. Without giving any money to Sky.