Hmmm...there is company called xnutrients that was giving out free hydro samples...you could try those..you get a micro, a grow, a bloom, and some cloning gel...so not too bad for free...but they don't ship to you...they ship to your local hydro store, but they messed up at mine...they sent 3 different people's sample sets in one box, but put my name on the outside of the box...so I get this big box and get home and open the box and there are 3 while kits with notes attached to them saying who they were for, and sure enough only one was supposed to be mine, but now I have 3 sets of free hydro nutes...I think I might try to use some of them in coco, so perhaps it is not a total loss..the only thing I use that is actual hydro is my cloner, and cloner's don't need nutes...anyway that is a cost effective option perhaps...
but since I hydro disagrees with me, I probably can't help to much with this. so Good luck, they are all basically the same, you just have to learn to use them...so give it a shot.