Reddit reviews Metro 2033 (in Russian)

https://www.amazon.com/Metro-2033-Russian-Gluhovskij-Dmitrij/dp/5170596782

It would help to know which country you live in to find a site for you. I found several offers on amazon.com though, as well as amazon.de:

http://www.amazon.com/Metro-2033-Dmitry-Glukhovsky/dp/5170785070/ref=sr_1_6?ie=UTF8&qid=1409645218&sr=8-6&keywords=metro+2033+russian

http://www.amazon.com/Metro-2033-Glukhovskii-Dmitrii/dp/5903396038/ref=sr_1_9?ie=UTF8&qid=1409645218&sr=8-9&keywords=metro+2033+russian

http://www.amazon.com/Metro-2033-in-Russian/dp/5170596782/ref=sr_1_5?ie=UTF8&qid=1409645218&sr=8-5&keywords=metro+2033+russian

Some imports are quite pricey at $68, but some others sell it starting from $19.

Harry Potter:
http://www.amazon.com/Potter-filosofskii-Philosophers-Russian-Edition/dp/535300308X/ref=sr_1_1?ie=UTF8&qid=1409645388&sr=8-1&keywords=harry+potter+russian

Hint and fun fact: In Russian there's no H like we know it, so when translating names it's often/sometimes replaced with G. So the book it russian is actually called Garri Potter. Maybe that helps with your search.

EDIT: Formatting

This link is just МЕТРО 2033, and this one is the Trilogy. I think any source of Russian reading will improve language learning, but having at least a beginner understanding will help more so you can at least get an idea of what is going on. And then you can learn new words to expand the details.