When I've bought taps in the past the counter staff always seem to ask if you want something that will last or something cheap, and if you answer something that will last they point you to Goliath products. Not sure how competitive they are* as I've always bought single taps and the price as been ok.
Goliath Threading Tools Pty Ltd. Australia's Leading Threading Tool Specialists.
* pretty expensive if their price list is anything to go by

