Shou Disciple lets you flurry with weapons, and gives you the basic flurry even if you don't have it. It was in a book (Unapproachable East) that came out just at the 3.0/3.5 conversion, so the terms it uses about stacking with monk are outdated, and it is unclear how exactly it should stack with the 3.5 monk. I think it should advance flurry, but YMMV. It also has full BAB and gives two bonus feats from a specific list.