I thought bluray was already abandoned. I never see blurays for sell in display ends anymore, Walmart has basically been forced to refocus on third-world-style living in suburban USA.
Where are you? They're as available as DVDs at most big-box, media, and electronics retailers in urban and suburban locations across the midwestern US, at least. Wal-Mart, sure, but also Target, Best Buy, Barnes and Noble, Fry's, most independent stores that sell, resell, or rent movies, and Red Box rental kiosks. They're also available from chain drug stores like Walgreens and CVS. Smaller and rural locations tend to have smaller selections, but that's true of most any product type.
Honestly, the only retailers that come immediately to mind selling DVD but not Blu-ray are gas stations and truck stops.