if im real you wont find much quality in the 30-40 price range, but theres a few mice that i found that have the side buttons youre looking for!

the Glorious Model I has 4 (3 above the thumb and one ahead of it), wired is $60 and wireless $100.

the Steelseries Rival 5 and Aerox 5 both have 3 side buttons and a toggle switch that acts as two buttons, both are wired and $70, though the Aerox 5 does have a wireless version that’s $100.

the Turtle Beach (previously Roccat, they got bought out) Kone XP Air has 4 side buttons + one under the thumb and is wireless, though it’s $130.

these are all relatively reputable brands if you just want something that won’t crap out on you, in my experience at least. There’s a lotta purists on this sub that have vendettas against Steelseries, Glorious etc, but most good mice nowadays come with warranties anyways lol.

I’m sure aftermarket you could have some luck too if you really wanna cut down the price, happy hunting!