My old one got squished in moving. It was a Kobo Klara I got as a gift. Before, I had a refurbished kindle paperwhite 7th gen that I liked the UI of much more but didn't like having an Amazon product.
Wondering what is out there now.
My main desiderata is that it has warm backlighting and is small. Would also like better .pdf reading than the Kobo that was basically non-doable.
I really like my Kindle Oasis. Picked it up eBay, looks like a lot of them are over $100, but you can check a few times and sort by price. Try doing some bidding or making an offer. Might take a little bit to find one, but it's a good one. 6 or 7 inch screen, really consistent backlighting, and you can message support and they'll just remove ads for you.