UPDATE 4: Black $138 ↑$2; Yellow $148 ↑$7; White $140 ↓$4; Silver $139 ↑$3

UPDATE 3: The White have dropped in price to $137. Back up to $144.

UPDATE 2: The Silver have dropped in price to $136. The black have risen to $136.

UPDATE 1: The Black have dropped in price to $134.

Looks like the delivered price is the cheapest ever, even compared to C&C /in-store prices at local stores.

EDIT: You can get the White cheaper at Amazon for $148.99 delivered, no Prime required. (Thank Rumbaar.) Note that this is not publishable as a deal since the store only has a 75% feedback score from 4 ratings, has no website, and isn't fulfilled by Amazon. (Sold Out)

TecoBuy Avail. Price Delivery Total Officeworks Price Price Beat Black 68pcs $138 $15 $153 Black $199 $145.35 Yellow ✓ $148 $15 $163 N/A White ✓ $140 $15 $155 White $199 $147.25 Silver ✓ $139 $15 $154 N/A

The only issues with TecoBuy are that they only accept payment via PayPal, and you must pay to send items back to their Hong Kong Return Center for any warranty repairs.

Looks like a Price Beat at Officeworks is the way to go. If you're lucky, they'll forget to add delivery costs. If you're unlucky, they might refuse to Price Beat. If so, call their Customer Service Team on 1300 633 423.

Past examples of attempts to Price Beat the $148 TecoBuy Black Buds deal at Officeworks: