Is my book too cheap?

Basics of Lean: better to test than ask.

Currently the book isn't earning you anything, so nothing to lose.. why not try and increase the price to $10-20, then you'll know.

This is entirely my opinion as a reader and not a writer, as I've never sold a book. Your kindle ebook version is on the cheap side of most books related to programming I've read. Kindle books do tend to be cheaper than paperback of course, but programming books from o'reilly, packt, .. still go for about $20 in my region. Such as my most recently bought one (https://www.amazon.com/Learning-Functional-Programming-applications-programming-ebook/dp/B0725B8MYW).

I'm not sure if I'm an outlier here, but I'm happy to pay a bit more for science / business related books. For fiction books, I'd prefer a lower price (5-15 USD).

So I'd raise the price a bit - considering you're self-published and don't have an obvious label behind you, maybe settle in the 5-15USD range.

Again, and I can't stress this enough, I have no experience actually selling books. :P

Good luck!

I've published a smiliar book, but on actually helping people get a software developer job. I didn't use your promotion tricks, I simply set a $9.99 price on Amazon then saw only a few sales, no marketing whatsoever, after a while I reduced the price to $4.99 and numbers went up A LOT.

Thing is, organic growth is far better in the long run. Readers want to get value out of a book, nobody just click on the top book of the list and blindly click buy. It's about content relevant to what they are looking for. You got plenty of reviews, but they are probably just the free riders who thought they would casually read your book thank you.

Don't think too much about exposure, rather identify how people can gain real benefits after spending time and a bit of money for your material. Maybe update your book content with what benefited you financially in your journey, and you will get actual paying customers. Don't forget the network affect, when people read a great book, they refer it to their friends. I think that's how my ebook sold so well in the last few months. It doesn't often sit at the top of the career or programming category, but people do find it and purchase it.

In comparison, I'm listed with just a couple of reviews, but they are genuine verified purchase reviewers, writing a reflection of what the content is offering. At 5 bucks, readers don't hesitate to buy because it's affordable for people who are serious about getting a real job, they likely don't have a lot of cash to spend, so price point is very important. Those who want to know how to get a salary bump or land a position at their dream company, will pay because they would spend hours and hourse reading through.

You may adjust the price, but I would rather question you value proposition there. By any mean I do not criticize your book and effort in writing it, I'm rather commenting on your path to get sales going up. Help people get valuable content , sales will naturally come, regardless of your marketing effort.

Try a 19.95$ after a 30% discount, see what happens... It also gives you some margin to actually market it