I think some of the finest, and current, recordings are the complete set issued individually, by Jean-Efflam Bavouzet on the Chandos label. Another set issued individually is by Noriko Ogawa on BIS. Very different from Bavouzet, more relaxed perhaps. And, one of my favorites, the 12 Etudes by Mitsuko on a Philips disc. And last, but not musically so, Debussy’s Preludes Books 1 & 2 by Paul Jacobs on the Non Such label. He also does the Etudes Books 1 & 2 and on a separate disc Images, Estampes, and Images series II.
I do not have any Arrau recordings to compare these to.
I buy from Presto in England. Stuff is priced well and often stuff is one sale. Delivery is normally 10 days, +/-. An when not available there I often buy from Amazon. As a Prime member I get shipping free for most stuff. I like Presto much more than Amazon - the have a great web site.