I use VO5 shampoo and conditioner. It's usually less than a dollar a bottle and works very well for me.
Use the smallest amount of shampoo and conditioner that makes your hair look the way you want to. I have short hair, so I usually just put a drop of conditioner on my hands after I wash my hair, then run my hands through my hair two or three times. I do the same for my nieces hair - long, very fine and thin - but start about two inches from her roots because her scalp is very oily. Of course, I have to use a little more conditioner - a drop about the size of a quarter. For her, sometimes I just put it in the teeth of her comb, and that works, too.
The conditioner can be used as a shaving cream when you shave your legs.