Just in case you aren't familiar with the two sites, have you tried Racks and Stands and Stands and Mounts?

They're two of the bigger suppliers on the net (though I haven't personally dealt with either). Shipping might be high, but you can always use the sites to find the right item then try to find it locally if shipping puts it beyond your budget!

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::