Iīd get a couple feet (or yards) of proper sized thin walled brass tube and have my friendly Machinist cut a lot of them (43 per foot).
After setting the Lathe up, you can make 200 in 10 minutes, for a very low per-piece cost.
For less than 10 or 20 units, pay through the nose for the ready made ones.
As with everything else, actual part cost is cheap, if you make enough, but setup fees or just "getting into it" set a "floor" below which you canīt go.
As an example, a customer ordered one of my 4 channel 100W mini Club Mixers, which I havenīt made for a few months now, and for which I have no front panels not PCBs left (Cabinet, PSU and Power Amp are "universal")
I cut, folded and painted 10 blank 2U high aluminum front panels (they can be used elsewhere), silkscreened 3 of them and 3 PCBs , the minimum justified because although actual screening takes less than 60 seconds each, the screens have to be properly washed later, which takes almost 20 minutes.
I will actually build 3 Mixer/Preamps anyway, even if only one was asked for.
(My "now that Iīm into it" Theory)
1 for immediate use, and about the 2 extra ones, I know that *if I have them*, Iīll sell them in a jiffy.
Worst case, I publish them in "Mercado Libre", our local branch of EBay.
Itīs good being able to make a lot of things "in house", without depending on external suppliers.