I'm very suspicious of this offer. Acrobat X is out of date now that Acrobat XI is out (and has been since last October). I went to the Adobe site and I couldn't find downloads available for X, only XI. The link to LexiMart that you provided is still showing X as being the latest version. Acrobat Pro normally sells for around $400-$500 with a disk. When I ordered the upgrade from Acrobat 9 (which reaches end of life next month) to XI Standard back in November, I got the disk free with free shipping but if I recall correctly, the disk would have been only $9 more plus shipping.
I googled Leximart. I found very few reviews on it and one reference that said it has been in existance only a few months.
Frankly, I would run, fast, not walk, from this offer. First, it's an out of date version. Second, you can't be sure the download is still available (I would want to get the download first to make sure I could get it before shelling out any shekels). Third, the company seems like it could be dodgy (based on little info available on it and the out of date product page). Fourth, at roughly one third of normal retail, the price seems too good to be true.