My opinion? The cheapest yet effective shampoo and conditioner option in the article? "Thick & Full, Biotin & Collagen" by OGX.
I have even seen these products at my local grocery store.
Can't find? Look on-line.
Either way, good and frugal!
Back in the day, I always used Paul Mitchell and had beautiful hair, compliments of my family. As I grew up and went on my own, I started using Dollar Tree shampoo and conditioner, which has totally wrecked my hair. Thin and ugly.
So, personally, the next time I am in need of hair care supplies, I just might take my own advice!