Reddit reviews Compatible with Brother TN-450 TN450 (TN-420, TN420) High Yield Toner Refill for HL-2230, HL-2240, HL-2270, HL-2280, MFC-7360, MFC-7460DN, MFC-7860DW, DCP-7060, DCP-7060D, DCP-7065DN - with Reset Flag Gear, Lever Included

This is an example toner refill that costs just under $7. You always want to get a recommended type of toner for your printer because you want a shade that your printer will not have trouble with, otherwise your shading might be way off.

http://www.amazon.com/Compatible-MFC-7460DN-MFC-7860DW-DCP-7060D-DCP-7065DN/dp/B004WSO73W/ref=pd_sim_229_4?ie=UTF8&dpID=41CZlKuC03L&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0D5136FJFXWZ5HJKVAF0

You can also buy the drum with toner already in it, off-brand. Typically branded drums cost about $45-$150. But off-brand, which I've never had issues with in over 5 years, cost $8-$25. This is an example, and if your friend is paying $600 for refills then they're probably for corporate grade printers. But typically it costs around $150-$300 for a cartridge that prints out 25,000 to 50,000 pages.

http://www.amazon.com/Compatible-Toner-Cartridge-Replacement-TN450/dp/B0062ZNYFK/ref=sr_1_2?ie=UTF8&qid=1458062293&sr=8-2&keywords=brother+laser+cartridge

An example of a cartridge for a corporate grade printer:
http://www.amazon.com/Xerox-4250MFP-Toner-Cartridge-1-Pack/dp/B0059LU9KG/ref=sr_1_4?ie=UTF8&qid=1458062513&sr=8-4&keywords=Xerox+4250+Copier

I got one of those on Craigslist for $30. I've been feeding it $7 bottles of toner for over a year (2 so far, not sure on the page count), it's great. I get these: http://www.amazon.com/MFC-7360-MFC-7460DN-MFC-7860DW-DCP-7060D-DCP-7065DN/dp/B004WSO73W

http://www.amazon.com/MFC-7360-MFC-7460DN-MFC-7860DW-DCP-7060D-DCP-7065DN/dp/B004WSO73W/ref=sr_1_1?ie=UTF8&qid=1404876339&sr=8-1&keywords=toner+refill+kit+brother