I've ordered off the website from markertek a couple of times with no problems at all. Yeah, it's not the fastest in the world, but the prices are reasonable, they carry everything, and I love the way they ship your stuff all organized. I placed an order for a bunch of stuff (six mic cables, some rt angle, some not, three guitar cables, some other stuff) and it came all labeled and sealed into separate little plastic bags. Pretty cool.
The site's not that bad when you get used to it. (This from a developer who's been forced to see/use/fix many abysmally bad sites, so take it with a grain of salt.) The trick is to not try to use the search to get one or two products like you normally would. Just get in the general ballpark, then look at the list on the right on your own.
Chuck