good.store has bar shampoo and a lot of other regular house hold items that you might need regularly. Also all of the profits go to charity.

Shampoo bars can work well, but keep in mind that if you leave them wet like a soap, they will melt like a soap. I was lazy and that thing disintegrated within no time.

You need to decide what you care about. If the plastic part is important to you just use any bar soap. It’ll clean your head just fine. However shampoo is meant to not only clean but moisturize and protect your scalp so it often has oils and stuff in it. The oils is what makes it runny and not really able to maintain a bar shape. You could just as easily use a bar soap and add scalp moisturizer after you shower but that would just be another plastic bottle.

I like Lush's cinnamon one.