I've been boycotting Amazon (UK) for a few years now. It's not easy! Sometimes it doesn't take much longer to source items, but other times it takes way longer. I have limits though, and occasionally I end up caving-in and just using Amazon, but it's getting rarer all the time. Now I use them once or twice per year. I tried using onbuy for a while, but we got a couple of faulty items from them and their support completely ignored me, so I stopped using them. Generally, here are some of my most common alternatives:

general stuff and gifts: Argos, ebay, etsy
tech: overclockers, ebuyer, scan.co.uk
electronics: John Lewis, AO, Richer Sounds
books/dvds: hive.co.uk, Waterstones, WH Smith
pharma: boots, simpleonlinepharmacy, well
household: Robert Dyas, Dunelm, John Lewis
pets: zooplus
spare parts: buyspares.co.uk

And for a wishlist alternative I use wishlist.com. (edited to fix formatting)

I recently started getting spam to my dailymotion account.

Another variation of this is when you used Google, and the responses to the post say "Use Google", or links to lmgtfy.

TIL