Looks expensive, I bought 5 kilo bricks of coco that expand with water to about... i dunno 15-20 gallons? 25 bucks.
Originally planted my plants into 100% coco but it does seem a little dense so I bought a monster bag of perlite and im mixing the two 50/50(well kinda just eyeballing it) and Im going to repot from the 1 gallon straight coco to the 2gallon 50/50. Obviously next time around I will start off in the mix, hopefully the different levels of moisture in the two mediums wont cause any problems. I like my mix because those bricks are easy to carry around and they fluff up huge, and with perlite to mix you can decide your based on personal preference how you want your medium.
Any idea what that stuff is even made out of? spaghnum probably?