Looking at the price I can hardly blame people for turning to alternative sources. Based on the wage there it would be like a bottle costing £150 or so here.
If people selling it on the black market are going to keep poisoning people it would be safer to make it yourself.
What is the typical power consumption of the steamdeck when in use? If you wanted to get an approximation as to how long a battery would last for. Also how much is efficiency likely to matter? If it was 30W and you had a 30Wh battery how likely is a 1 hour lifespan going to be? Would efficiency just be a rounding error or something like cut in half.
Checked my game purchases, typically spending less than £20 a month on PC games. A lot of my playtime is in games I already have or are FOSS.