Well i thought the same, but it's not that expensive. If you catch a sale or some discount coupon, you can buy a large bundle for a bit over 10€. I have that pack for few months now, and i am not even at half. And i don't use it just for sous-vide.

Anova is currently the best price/performance you can get for home cooking. And it's easy to put it in a closet, when you don't need it.