If you're hunting for an online spot to read 'Marriage By Contract with a Billionaire', I usually start with the obvious legal storefronts: Amazon Kindle, Google Play Books, Apple Books, Kobo, and Barnes & Noble. Publishers sometimes put romance titles on those platforms, and buying or borrowing there ensures the author gets paid. I also check serialized fiction sites like Webnovel, Radish, Tapas, and Wattpad since many contemporary romance novels get serialized or host similar works. For comics/manhwa versions, look at Tappytoon, Lezhin, Manta, or WebComics if the title is an adaptation.
Libraries are a quiet little lifesaver — use Libby/OverDrive or Hoopla to see if your local library has a digital copy. If I can't find it through stores or libraries, I search the author's official website and social media; they often post where the book is available or announce translations. I try to avoid sketchy scanlation sites because they harm creators, so my rule is: if it's not on a legit store or the author's page, be patient and keep an eye on trusted community mentions. I once tracked down a rare novella this way and felt pretty proud of the detective work.