You can get a Kindle reader which starts from $89, you can get discount of $20 more if you go with Kindle with Special Offers. Both models are same but the difference is that Kindle with special offer will display sponsored ads on home screen when its idle.
You can later remove ads by paying $20 anytime by going to your Dashboard on Amazon.com then click on Manage your devices and select your Kindle and click on Edit next to the Special Offers link.
Our friend Amit has shared a cool trick which let you remove ads from your Kindle for free without any hack.
All you have to do is contact Amazon support team and ask them to disable it as all these special offers can be claimed in US only, so if you are outside of US then they will disable it.
Open Contact Us page on Amazon and then select your device from list, now navigate to Issue-> Kindle Device -> Kindle with Special Offers -> Problems claiming offers, now select chat option and here you can request them to disable it as you are outside US.
This trick also applies on Kindle Paperwhite and Kindle Fire tablets.