Cheap Spectrometer version

[kirbah]

Any suggestion if it is possible to use some cheaper version of Diffraction Spectroscope? Here are few samples
https://www.amazon.com/Handheld-Durable-Small-Diffraction-Spectroscope/dp/B00MNEAMF4
https://www.amazon.com/Gain-Express-Diffraction-Spectroscope-Identification/dp/B017VM4Q86

The only obvious issue - there are no details regarding diffraction grating of lines/mm.
Aliexpress price for them are around $25 - https://www.aliexpress.com/item/32625200308.html

Instead of RPI + camera it should be possible to use $5 USB webcam and attach it directly to PC https://www.aliexpress.com/item/1005001465072245.html
Another $5 USD for the lens with zoom https://www.aliexpress.com/item/4000617323132.html

I am looking for some cheap spectrometer version and initially found webcam + dvd piece + wood box version https://www.youtube.com/watch?v=MgogwcXUIoc&t=131s
I really like PySpectrometer since it looks great. Now I am trying to make a really cheap version but with reasonable quality.

[sctv]

Hi @kirbah , publiclab has lots of resources on cheaper builds https://publiclab.org/wiki/spectrometry, extract a diffraction grating from a cut up dvd. Not sure of the resolution.
Cheers,
Brian