Blueray is two things:
a) a technology that delivers higher quality video DVDs – sharper, better, etc. This only is noticeable if you have a high (1080) quality high level digital TV. Otherwise the effects are pretty much lost.
b) From the business point of view, Blueray was a blatant attempt to jerk consumers around to buy yet another format (we used to have VHS, then DVD, and now Blueray) so that we would buy the same movies in a new format. It didn’t work Blueray, from the business side, has been a failure. It didn’t help that Blueray disks, when they first came out, were double the cost of regular DVDs.
Streaming is in the process of replacing the idea of a physical DVD anyway.
If I were in your position, I would buy a low cost regular DVD player. Unless you are a serious videophile (which I doubt) there is no benefit to buying Blueray.