any good Catholic book store will carry one of these in stock.
There are also a few different online versions available, one such that I like is:
Douay-Rheims Bible + Challoner Notes
There was an audible version online as well; however, my link appears to be broken, too bad, it was done quite well.
I also like this protestant website (
biblehub.com/ ) in that it carries a cross-indexed/sidexside of the protestant and catholic versions of text (note that the Apocrypha such as Maccabee and Tobit are not directly in the listing… of course

)… being a convert I enjoy seeing the comparison between the texts I learned to those I’m re-learning. The site seems well put together and I’ve not found any difference between my hard copies and the online copies so I do believe the site is trying to be honest and faithful.
Your favorite search engine should turn up a few more sites.
Many of the online bookstores appear to have the DR for sale, including B&N and Amazon and of course, the Catholic bookstores tend to have websites.
Finally, talk with your local parish. You’d be surprised how many times we have had a family donate bibles to the church - often blessed so they can’t be sold (well shouldn’t be) so we either give them to new converts or if someone asks, they can have it… of course, a free will donation is greatly appreciated, never required and never asked for at my parish.