counted the three consumer mail hosts before answering, same source i count from every morning.
gmail.com 550,919,909
hotmail.com 107,114,342
outlook.com 17,984,045
those are rows where the host is the mailbox itself, so the login on the line is a mailbox login, not a site login that happens to carry a gmail address.
2000 lines off one host is one fill for me, you'll get the count first and then the file.
$0.30 a line single, $0.15 a line from 1000 a week up.
no age claimed and no percentage on a batch, so five lines go to you in a pm first and your test decides the rest.
which host do you want the first 2000 from, gmail or hotmail? tg @alex_desk1 if you'd rather do it off the board.