Having worked my way through the pragstudio course and spent a lot of time looking for other resources, the course is well worth the money spent and is the fastest way to learn. The only downside of the course is that you don’t build a single thing, so you do need to ability to generalize certain concepts and ideas, but it does an excellent job of introducing LiveView. It does assume that you have some understanding of Phoenix and Ecto.

There are many free resources. To name a few:

The official documentation

Elixir school

Elixircasts has a free section

Alchemist.camp

Etc

But cheap and fast is a difficult combination. It also depends on your current knowledge, and your goal.

Copying what I posted in another thread:

Don’t forget you can get 35% off PragProg books and 20% of PragStudio courses with our devtalk.com coupon code

You also have a chance to win a copy of Programming Phoenix LiveView by participating in our spotlight on Bruce Tate over at DT:

If you’re already comfortable with Elixir and Phoenix and just looking to learn Liveview, give Programming Phoenix Liveview from Pragprog a look. There’s also a book club for discussion of the book!

“Being expensive” is a relative concept
Having said that, I deeply appreciate PragmaticStudio as they not only have excellent content but provide Parity Pricing, ie, if you are located in a country with lower purchasing power you have discounts that, as I know, goes at least 60%, so if you really live in one of these countries you just need to use a discount code they provide when you access their webpage and you get a price that should be fair for you.
I wish more would be like them.