Get a used aquarium on ebay with a cover and lights. Doesn't even have to be waterproof any more. Then just fill with hydrocorrels soaked in hot water and you can also add a aquarium heater in a small water container to heat to the desired temperature. Also don't put the cakes directly on the correls, like they show you on their product, since that will spread bacteria, yeast etc. very fast. I bet you can get an aquarium for five bugs and the other material needed for another 10-20$.
The name "Hydroshrooms" is IMO just for bullshitting people. It's a common fruiting chamber and has nothing to do with hydroculture.
It's a nice little toy but nothing more and I highly doubt significantly increased yields because you have a fancy box you probably won't use it for long anyways, since it's so small. Get a pressure cooker for the money. You can buy a very good used one for that price and it will be much more usefull for your mushrooms endavours in the long run.
Other useful things you could buy or build when you already have a pressure cooker:
Petri dishes
(DIY) Glovebox
Bunsenburner
Glases
Heatproof plastic grow bags
Substrates
Rare mushroom genetics
(DIY) Hepa filter laminar flow hood (a bit more expensive than a glovebox, but worth the investment, if your commited to growing)
Lots more used aquariums
Incubator (old fridge, styrofoam box, or other insulating container with heater inside)
Syringes
Laboratory glas
Scales
...
You won't become a good grower by buying fancy stuff, you will by doing the process over and over again and learn about how the shrooms grow and how to work sterile!
