Ac wholesalers.com
kingersons.com
Keep in mind most warranties for the better brands require a pro to do install,Mitsubishi included and thats where id be spending my money.
Mitsubishi has a better warranty overall from what I've gathered. I've used a 3 ton Fujitsu and it was dope. Ultra quiet but one thing keep batteries in the remote/thermostat at all times so it doesn't turn off. My supplier can save a few hundred maybe but I'm in LA.
Hit up cannabisjohn, he quoted me 2300 on a 3 ton mitsubishi mr slim, said hed drop a bill or so if bought multiples. The slims are pretty much as high quality as it gets