I am looking for Euler's Opera Omnia (in Latin), but it seems to be published ("officially") only by Birkhauser, and each volume costs about 140$, from what I have seen.
I found some of Euler's works printed by Kessinger Publishing, Forgotten Books, etc. that seem to reproduce, by OCR, the original writings which is what I am aiming at, even though I have heard that OCR is not yet sufficiently well developed to recognize the text perfectly everytime. These editions are much less expensive.
Could anyone with any experience with these OCR publishers, that could tell me if theirs mathematics reprints are good or not, please?