In my case
Suppressor - SWR Spectre around $500
Pay BATFE - $200
Class III FFL transfer for the silencer - $25
Then of course a trust to register the suppressor under - Already had one.
The pistol itself was only going to cost about $325. - $200 for a MKII 22/45, have the front sight set back and barrel threaded and a barrel nut made, $125.
So I'm looking at close to $1200 after I buy a few extra mags and a few bricks of .22lr.
Now for $100 I get a threaded barrel for my 10/22. The can runs double duty on the two Rugers. I rarely shoot them without it.
Stopping power: The power some guns have to make you stop what you are doing and get your wallet out.