Weha Xubi diamond polishing pads are absolutely the best bang for your buck.

What are you looking for in a low cost polishing pad?

Quality of Polish?
The Xubi diamond pads will achieve a high gloss polish without having to use a buff pad.

Life?
Xubi pads are a full 3.0mm thick diamond pad. Compare that to the low cost pads you are using. Does the company you buy your cheap pads from tell you the thickness? if not more than likely they are afraid to tell you that it is 2mm thick. This will reduce your life by 30% compared to the Xubi pads.