Help a Reader!

I had someone ask me if I knew how to save money on printer ink. She has a laser jet printer and the cartridges cost about $70! They do last much longer than ink jet cartridges but it's time to buy a new one. I'm not sure of the brand but I thought maybe someone could help us all out since I don't know and my research isn't turning up any great solution. 

Do any of the office supply stores have savings programs that might help? Is there a place to buy laser jet ink (online or otherwise) that is consistently cheaper? Any and all ideas are welcome. She is a reader so you can post your comments here and I'll let her know to check back.

Thanks so much in advance!!