some brands (actually, just samsung) come with "start packs" which are 1/2 or 1/3 capacity toner cartridges to reduce the purchase price of the printer.
Another thing to consider is that although all brands have now standardized 3000 pages per cartridge for consumer-grade printers, and 5000 pages per cartridge for commercial printers, HP and samsung both have the printing drum contained IN the cartridge, so the toner is the only operational cost, vs. some other brands which still make you purchase the drum and toner seperately!
Buying a laser printer demands a lot of attention, but once you make the purchase, it will save you lots of $$$ and should last you a VERY long time.