Instruct: Classify Amazon reviews into positive or negative sentiment
Query: The bulbs don't last and can't be replaced

I bought three of these a few months ago. Only one is still working. The bulbs on the other two burned out after very few hours of use, and I CAN'T FIND ANY NEW ONES. I tried contacting the seller and Amazon and received no answer.I agree these are very low-priced. I now realize that means they're considered to be disposable.