Can't Believe...
...That they want $325 for a used TriStar EX-20 with bojack tools! Plus I note they've photographed it from the right side, instead of the left where the emblem is. Might not mean anything, but that sometimes means that the emblem is damaged or missing. Since the emblem is mounted through holes in the canister body, an emblem that's partially or completely missing will mean air leaks. If you're looking at a TriStar of this vintage online, always insist on seeing the left side, so that you can take a good look at the emblem.