FWIW, Instant Pot now makes a sous vide circulator too. I bought one on Black Friday, and it works pretty well (although that's from the perspective of a n00b). It's cheaper than the Anova and other big names.
It looks to be about the same price as Anova. They're both in the $120-$130 range. It's amazing how these circulators have come down in price. Wasn't that long ago your choices were DIY or about $800 for a Polyscience.
I think it is amazing that so many are still so expensive. It is just a heater, a little motor turning a fan, and a thermostat/timer. There seems to be less involved in most of them than a $30 toaster oven.
I'll not try to justify the pricing, but they're still relatively low volume niche products. It's also not really accurate to compare the thermostat to a toaster oven. For many applications, sous vide depends on very accurate (less than one degree deviation) temperature control. When I bought a PID temperature controller to do the standard DIY slow cooker thing before the less expensive circulators existed, I paid close to $100.
