Cheap machine, expensive refills

Everything was fine until this machine ran out of carbon-like film (gee I thought that was obsolete!). Ordered refills rolls--VERY expensive. Claims to last for 150-300 pages. Lasted maybe 50 pages on the first roll ! Runs out without warning--including in the middle of receiving a fax. No indicator to tell you it is time to change the roll--just boom, it's out. Not too well designed. I would choose something else. I plan to use up the refills and buy something else and sell this at a YARD SALE !