Quick Ship Toner - good products and cheaper prices -
The only problem with a brother printer is you have to also replace the drum every now and then, which can get pricey if you don't shop around. If the fuser goes, you're best to buy a new printer.
I prefer HP - to me they're much sturdier. Yes you may pay a bit more but, IMO, they're better workhorses. If you're just starting out I'd suggest checking ebay - I got an HP4300 dual tray back in 2013 for $200, included shipping - it's still going strong..
Whatever you get, make sure to pay attention to print speed, print count (if buying a used one) and monthly duty cycle. You need to know the printer is going to be able to stand up to the work you're going to put it through.