William Optics 2" SCT Dielectric Star Diagonal was advertised at Adelaide Optical for $349 last month. OPT have them for US$230 (AU$307) + postage.
http://www.optcorp.com/product.aspx?...=diagonal&st=2
Telescopes.com are US$229.
http://www.telescopes.com/products/W...CTs_35327.html
Getting a WO diagonal is near the top of my shopping list too. From those prices, Adelaide Optical is actually quite reasonable for a change so that's where I'll be going unless something cheaper comes up.