If you're looking to solve itchiness, I'm not sure Fromm is the way to go. It's a very "busy" food with quite a few ingredients. I LOVE Fromm... as a company, their ingredients, everything... but Jackson itches when on it, and gets softer poo, and eye boogers. It's unfortunate. He tolerates almost anything but can't the Fromm after a few different attempts.

Most Yorkies do really well on it though.
He does best on Acana. They do have the Singles line now, but it's definitely pricey (I pay $18.99 for a 5lb bag of lamb & apple). We're on the grain-free variety of Acana now which he does well on too. Most LID foods are going to be a bit more expensive. Fromm is actually one of the cheaper foods here at my local pet store.
If I'm going to order online and don't want to buy a big bag, I throw in some treats and chews, etc, to add the price up to $49 to get the free shipping. It's stuff we needed anyways so I look at it that way.