A number of editions and translations of Rene Descartes' Meditations, Objections, and Replies are available for purchase. The links provided here are Amazon affiliate links, which means that if you click through and purchase from these links, Amazon pays me a small affiliate fee.

The editions I typically use when I am working on Descartes are two. The standard scholarly edition of Descartes' works containing the Meditations, Objections, and Replies is

• The Philosophical Writings of Descartes, volume 2, Cottingham, Stoothoff, & Murdoch translation (Cambridge University Press)

I also particularly like this edition which has both Descartes' original Latin and the French translation:

• Méditations Métaphysiques (Presses Universitaires de France)

Here a number of English translations you might consider checking out:

• Meditations on First Philosophy with selections from Objections and Replies, Cottingham translation (Hackett)
• Meditations on First Philosophy: with selections from the Objections and Replies, Moriarty translation (Oxford World's Classics)
• Meditations On First Philosophy, Lafleur translation (Pearson)
  
• Meditations on First Philosophy/Meditationes de prima philosophia: English and Latin Edition, Heffernan translation (University of Notre Dame Press)

If you would like to listen to audio versions of the text, you can find them at Librivox:

• Meditations on First Philosophy, Veitch translation
• Six Metaphysical Meditations, Molyneux translation