M1913 folding pistol braces, let's talk options

Just picked up a Ruger PC Charger and want to buy a brace. However, everything I've seen is out of stock. Price is also a consideration.

What I've seen:

SB Tactical variety $150-$200 range, out of stock

Sig Sauer 1913 interface folding knuckle $100, out of stock, would also require purchase of buffer tube + brace. The SB Tactical SBA3 seems nice but also $130 so total equals $230

That's pretty much all I'm aware of. I did run across a Sig MCX folding brace for $170. I know it's also 1913 capable but not sure if it's specific to that gun. Or if it would be a good option for the Ruger.
https://www.opticsplanet.com/sig-sauer-pivoting-contour-folding-brace-for-mcx-mpx.html

I have a friend willing to give me a SB Tactical SBM4, would need to buy a pistol buffer tube and adapter. You can get a non-folding adapter for $40. So that would put me in the $60 range but it's non-folding.