I've been reading about this for a couple years now, but the price has been too much for something that I would only use occasionally. But now there are immersion sous vide heaters from Anova and Sansaire for $199. So I poked around the 'net, and SousVide are offering their Supreme Demi water oven plus a $129 vacuum sealer (that I would have had to get anyhow) for $329, making the cost of the oven essentially the same as the immersion machine. SousVide Demi Supreme
The Anova is a nice product that I would feel confident with as well.Anova sous vide immersion heater
Just a heads up on some good deals, I haven't actually used any of them, but both products have received almost uniformly excellent to outstanding reviews.