Printer Toner

So our printer has been running out of toner oddly fast lately, and I think it might be the refilled toner cartridges. Have any of you ever run into that before, with used cartridges? Is it normal? We get them used for $90, and they go for about $160 new.

Follow-up question: Does anyone know of a good place to get HP toner at a good price, or is it pretty much the same everywhere?

:beer: