Any book from Jules Verne translated in English should do
I also think that some popular YA books* can be good, if you like this genre, because it's easy to get caught into the stories so you want to read more and the sentences aren't too difficult. In that case, the price might be higher than what you're willing to pay but if you convert your books you can find +50% coupons to use at Kobo store.
* thinking The Hunger Games, Divergent...