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NOV has multiple trial sets on sale for $ 10 via their US site.

Looks like you can get free shipping on purchase of any trial set.

NOV III Trial Set
https://www.nov-usa.com/special/n…l-set.html

NOV AC Trial Set
https://www.nov-usa.com/special/n…l-set.html

NOV AC ACTIVE TRIAL
https://www.nov-usa.com/special/n…l-set.html

You can use code NOVKIT to get another 9pc trial kit.