I got mine from
Save On Tests and got BFPs at 10dpo both times. They take within a week to arrive from Canada (first time I ordered was 1wk exactly, 2nd time I ordered on the Friday, they arrived on the Tuesday - crazy fast!!).
Other people here use Deal Extreme, and Oracle (google them, I'm not exactly sure of the website details). They're the only ones I know of. Good luck TTC!