Note: I'm new to this forum... but have spent the last couple of months obsessively checking Craigslist and FB Marketplace... so I'm pretty good on used pricing in my area at least.
If you're patient... don't buy new. The real question on the one you've shown is whether that performer is as good of a deal as you can get. It sounds a bit high to me (but I'm only really able to comment on the Chicago area US market... and simply don't know what kind of volume of used webers you see where you live).
I've seen nice performers go for as low as $60 US (that got snapped up quick), often $100ish, and I just paid $125 for a really desirable stainless steel red mist performer with zero rust. 9-10 condition, only because the stainless top had a few scratches.
The bigger questions I'd have relate to the generation of performer, and more importantly (in my opinion) the top. The newer ones have a black metal top; The slightly older ones have a dark grey resin top. The one you're looking at has the lighter gray top, which often look bad, and are hard to keep decent looking.
IF you're going to pay a normal (or premium used price), be patient, and get some of the features you like. (Colored kettle? Newer top?)
I'd suggest monitoring your market for a while... rather than getting the 'first' one that seems to be a decent deal used. I doubt this one is a 'steal' that you'll never see again; It is a common kettle... probably at an average used price.
If it were a red mist, or the 'perfect' one you'd like to have, perhaps move on it... but it seems like you'll see more like this.
I'd suggest being patient and learning your market.