Over the last couple of months, I've been shopping for laptops and I've noticed that Dell and Lenovo are literally always on sale.
Not every model will be on sale, but some model on their site will be - so if there's a particular model you want, and you can wait, you should just wait till they're on sale because it's usually quite substantial (30 - 40% off)
Case in point is the Inspiron 7000 Black edition which is currently 2k - down from 3k (https://www.dell.com/en-au/shop/cty/pdp/spd/inspiron-15-7591…). Last week it was the silver edition that was on sale.
Lenovo has similar sales all the time too.
I haven't seen any big sales for HP though. So if I want to buy a HP laptop, should I wait for a sale or should I just get it because they rarely go on sale?
During Black Friday,Click Frenzy and Cyber Monday it was up to 40% off. Maybe wait til Boxing Day.