KEEN tend to the wide fitting, the original US models are huge, the later, European-lasted ones a bit less huge, but still pretty generous. The Berghaus leather boots, which were previously Brasher boots are comfortable and again, very wide fitting. Hanwag has some specific wide fit models, but probably out of your price range. The Inov8 hiking boot is also pretty high volume in the forefoot, I had to use a volume reducer to stop my feet sliding about in them. TNF has a nice last with a reasonably broad forefoot, but a narrower heel.
Really though you need to try stuff on with footwear if your feet are anywhere beyond normal distribution. Your idea of wide may be different from mine. You may just have high volume forefoot rather than a wide one. Your heels may be wider or narrower than average. You’re basically looking for a brand that thinks its typical customer has feet designed close to your shape as they’re all subtly different, sometimes even across different models of boot – Scarpa for example has pretty wide boots, but also some relatively narrow technical lasts on its mountain boots, but not all of them… so yeah, try lots on and see what fits without hot stops and heel slippage.