Santa came today…either he’s real late or super early 
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I tested one of the 15 PCBs and it’s all looking good. Will test the others as well, flash the controllers and then I can ship them out next week.
Including customs fees + shipping to me, the price per controller including one temperature sensor came out to 35€/30£, a bit more than anticipated earlier. There’s definitely room for saving some money in the next version, but for now I’m quite happy. I’m not aiming to make any profit off these for now since this is just a hobby project, so I’m happy to send them out to anyone interested for the 35€ + shipping.