Where can I get blade part for smoothie plus 600 blender ?

Hello -

Apparently the Smoothie Plus 600 blender was made with the Back to Basics brand name. Apparently, Back to Basics products were manufactured by the West Bend Co.

This is the link to the West Bend Co. Contact Us information:
https://www.westbend.com/support/contact-us.html

On that web page you will find the toll free phone number for Back to Basics products. Call the Back to Basics number during weekday office hours and ask about the availability of a blade part for your Smoothie Plus 600.

Best wishes.