Mwave has a promotion where you get a tenkeyless mechanical keyboard and a matching mechanical numberpad for $89 ex shipping. It is available in Kailh blue or brown switch configurations. Shipping is $9.95 to NSW/ACT/VIC, with free pickup available.
I haven't used this model, but it seems a very reasonable price for an entry level mechanical set. Mwave's RRP for the KB is $99 and the numpad $40, so this is a $50 saving. According to StaticIce, the keyboard only can be had for $17.5 less than the bundle, but this is the cheapest I can see for both together.
The detachable numpad is especially good for southpaws, and the review excerpted below is positive:
Cherry or Kailh regardless, though, the Tizona is a nice pick for gamers or heavy typists who are pressed for space, and it’s of special interest to lefties. The keyboard has a complementary numeric keypad, the Tizona G2N-P, which is a $30 optional add-on. It can snap onto the main Tizona G2N keyboard, on either the left side or the right side of the body