It's relatively expensive. I think the cheapest I found was a refurb kit.. it's around $10 for black and $15 for color, which means a total of around $55 to refit the printer.
On amazon, if you had a brother printer, you could get a full set of refills (4 black and 2 of each color) for $10.
damn, that is a big difference. on ebay they have a BIN refill kit with 1 bottle of each for $20. but I dont know how hard those do it yourself deals are.