If you're in the UK then many public libraries have subscriptions to the OED which include "remote access". This means you can log in from anywhere just by putting your library card number into the OED's login form. So check that before signing up for a hundred quid a year :-)
>>pm215+(OP)
This is also true for many colleges & universities in the USA. If you have any university affiliation, check with your university library system first.