Thermal underwear. Entering the 10th year of a 30 euro Helly Hansen long underpants that keeps me warm half the year.
Raspberry Pi 4 that served as my daily driver for around three years.
A couple of dumbbells that got me started with weight training, and kept me going during covid. Together with the basic equipment that I later bought, it saved me hundreds and hundreds of euros in gym memberships.
Best purchase under 10 euros is a simple cube with blank memo notes, that I use for grocery shopping and all kinds of other to do lists.
Daily driving a Raspberry Pi 4 as what? If you, don't mind me asking
As my normie machine to watch Youtube, browse the internet, etc. And as my dev machine as well, including programming and editing images/videos.
I also wrote a blogpost about it: https://www.heyhomepage.com/?module=blog&link=1&post=4