I bought an agitator assembly, container bottom, and sealing ring for an extra Oster blender jar that came with a new blender. The order shipped fairly quickly, but when it arrived, there was no sealing ring. I contacted customer service, and they submitted a refund without offering to send the missing part. I requested a refund for the whole lot and was told I'd have to pay the shipping cost which was over $6. I will use Amazon next time!