I just request free samples from different companies and get all kinds of nutes for free. XNUTRIENTS is what Im uising now, just started but easy-to-use and so far so good.
I too use the shit outa some samples...got advanced running on this batch of girls....
Just make sure what line you do go with is in your skill range.. the general hydro 3 part worked great for me till i was able to really dial shit in big time