there are several put there the first I remember from a couple years ago was a Cuisinart CSO-300 smaller I think than the Anova, but I haven't looked into either much. There is another one Tovala or something like that also. I believe both are less then the $500 Anova (that was what it was when I looked at them).
If my Breville smart oven ever goes I would think about one from someone. The Breville makes some fan noise when it starts so it may not be long on life, but has been used hard for life it has lived.