If you buy these old new stock off Ebay, there's two things you should do right away: replace the battery and update the firmware. This will be a guide for doing so.
You get a somewhat beat-up looking box
This is what your $35 US +shipping gets you: Fixture, power supply, manual, hanging hooks.
These are supplies needed for stage 1: battery change. T10 torx bit, 3mm allen key, cr2025 battery. I'm using cr2032 because that's what I have on hand. cr2016 would likely work as well but I didn't check that.
Remove one of either end caps with the torx bit.
remove the back panel with the 3mm allen key
These are not cheaply made. No resemblance to a black box which would likely be more expensive.
use the hockey stick end of the allen key to push the old battery out of the holder.
You get a somewhat beat-up looking box
This is what your $35 US +shipping gets you: Fixture, power supply, manual, hanging hooks.
These are supplies needed for stage 1: battery change. T10 torx bit, 3mm allen key, cr2025 battery. I'm using cr2032 because that's what I have on hand. cr2016 would likely work as well but I didn't check that.
Remove one of either end caps with the torx bit.
remove the back panel with the 3mm allen key
These are not cheaply made. No resemblance to a black box which would likely be more expensive.
use the hockey stick end of the allen key to push the old battery out of the holder.