My apologies but I have abandonded this project, per my most recent post to the categories list. If you're not a member of AMS, SIAM, or LMS and would still like to be part of a group purchase from Amazon, please let me know and I can put you in touch with the others in that situation who've contacted me.
According to the e-mail I received from Ms. Jones (see below), this is available only from the UK catalog. So those of us in the US may still find it worthwhile to go through Amazon, or wait for the possibility that similar discount may be offered in the US at some point in the future. -------- Dear Mr Rao This discount is only available in the UK catalogues (OUP distributes and markets AMS titles in Europe) but I am making a discretionary exception for Prof Pratt because of current unavailability of this title in the US.