Where can I find Chad's videos?

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you can still get his videos on coursesaver. the other website is chemistryprep.com or something like that.
 
Are QR videos good from Chad as well? Is it worth to pay 50 dollars? Is there any discount I can get?
I used Chad's QR videos for a basic review and found it helpful. As far as discounts, ASDA used to offer 25% off for members, but I am not seeing that on their website anymore.
 
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