Well the problem is that by the time you've worked your way up to learning the weapons you've probably been training in the system at least 8-10 years, so you really want to learn the version taught in your own lineage. In "WT" and its off-shoots, the weapons are "prestige" techniques and held back for a long time. Too long in my personal opinion... but that's neither here nor there. Still, you are correct Xue. There are some really good people out there who will teach this material to their students in a reasonable time at a fair price. You just might have to travel a bit. Like I said, my instructor is in Austin and that's about 1,200 miles away.
Another alternative is to work with other weapons. I'm the chief instructor for Escrima in the association I belong to. (I was first certified to teach by GM Latosa in the mid '80s.) The Escrima we teach dovetails very nicely with Wing Chun and is actually more practical for modern self-defense than the traditional WC weapons. EBMAS and the EWTO have similar programs, but I have no idea what they charge. I teach at a Y and in the park and would never turn a good student away for purely financial reasons.