Some brilliant suggestions on here, bookmarking this thread!
We're also looking for alternatives to Amazon as we've been truly appalled at the way they've treated their staff through this (and before, but now it's even worse), and the huge amounts they make per minute, plus the derisory donation they gave to the booksellers' fund (the profession they've managed to pretty much destroy), their lack of tax payments, and the fact they've now effectively turned into Blue Sun from Serenity....we like:
&Keep for green things
Lakeland (although they do use Hermes as the courier, which gets a thumbs down as one of our Hermes couriers is an absolute harpy; the other one's lovely, but you never know which one you're going to get - if I know the courier rep is bad, it can stop me ordering with companies)
Petsathome
Argos for some things (though we try to get them elsewhere first and we buy a lot of reconditioned or second hand electronics where we can)
Pipers Farm for meat, Abel & Cole and our local community farm for eggs/dairy/fish/veg/fruit - we were just about to sign up to Milk & More when Lockdown hit and we know there is a local farm where you can take your own bottles and buy milk direct
Gourmet Chocolate Pizza company (I think that's their name anyway)
Alibris for used books (we used to use Abe until Amazon swallowed that up as well)
Kobo for ebooks (definitely going to check out Hive as well now)
We do try to buy local a lot anyway, and when this is over, or at least Lockdown released temporarily, we'll be making even more of an effort to do so.
Other half does a lot of art and craft work alongside the day job, and we were all set to start selling and going to craft fairs literally just as Lockdown hit - we're trying to investigate selling on Amazon but God, it's expensive, and their customer service, when you're a seller, is abysmal.
They've charged us 2 months "tax" already even though they haven't actually approved us to sell! Years ago I used to occasionally sell textbooks through Amazon (just my own old ones, nothing systematic) and I found I ended up paying more in fees than I got for the books. I also know someone who is signed up with Amazon's affiliate marketing scheme (not me), and their commission on purchases is being cut by 50 to 70% so they're also actively looking for other options right now.