Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Hard to find replacement filter

I am very happy with this vacuum in the beginning, however, I could not find the replacement filter easily. Now I do not want to use this vacuum. Without a new filter, it does not do its job right and become a piece of junk. Before purchasing this item, make sure you will be able to find the filter in the nearby store, it costs six dollars and needs to replace every other month to achieve good performance