oops.se
Yes, and "on reel" there are many different types.
1. Single LEDs
2. Multiple coloured LEDs:
- RGB /Red, Green, Blue)
- RGBW ( W=White)
3. Addressable LEDs
1 - knowing a reasonable price and place to source the LED strips
This depends on quality, delivery time and amount.
2 - knowing what I need to do to power these - are there any gotchas?
WLED has a toon of info about this and even a calculator.
3 - knowing what I need to do to make this work from a lighting box for a stage
No. Perhaps the WLED discord is the right forum to ask that.
Note a single i is always a capital i = I.