Yes, a good price to take a punt on.
I've considered those types of product, and still might, but *if* they are for stopping the disks getting rusted up (and hence pitted) if left a long time, I'm not sure if they are th elixir of life. I mean, even if it isn't raining, if a car's stored outside their disks often get an orange sheen simply from moisture in the air (esp if the wind is more westerly). So I'd be surprised if disks looks shiny silver even after a short time. Plus, the back of the disks, although protected to an extent by virtue of being on the back, rain/moisture ect gets everywhere, so covers don't give protection there. Sometime, if a car's stored outside, one can 'kill it with kindness', where on one hand you an fill the tank up with Super/Premium and let it sit for ages, maybe using a charger now and again to keep the battery topped up, but all the while the disks get walloped day after day and risks them pitting. I find I try to pick the 'best' day I can (say when it's dry, but after a prolonged rainy spell which has washed a lot of the prior cold snap salt away), about once a month, and give it a blast for 25 or so miles, to get everything warmed up to operating temp and scrub the brake disks lean. I'll hose the undercarriage before the next time I do the same (i.e every other winter spin, and not hosing it straight after as obviously you'll just soak everything up again). This way the car gets a few spins over winter, and I'm sure a few hundred miles of maybe not ideal conditions isn't going to render it falling apart lol
Of course too with a 2 tonne bus, you an get flat spots with it sitting around for too long.
