Well, the 'active ingredient' in these things is the bulb and a reputable brand (Philips medical) runs about 150 euros for a 100w tube with a R17d plug:
You then just need the right ballast for it and a basic timer, maybe a reflector and stand and you're in business. Getting smaller qty is going to be an issue since these suppliers tend to sell in packs of 10.
Apparently the a ballast runs about 70 euros and can power two bulbs.
I might look into it since it's down right affordable compared to the alternatives.
https://www.dermahealer.com/products/dermahealer-uvb-light-t...
https://heymedsupply.com/kernel-corded-handheld-311nm-narrow...
I might use one of those for most days and a lizard UV lamp one day a week too (1 minute)
But if you find a more affordable to the Sperti please let me know