I got mine at Brentwood Town Center in Burnaby, BC.
I asked if they'll be getting any more, but they said not anytime soon.
I checked Metropolis at Metrotown, but they only had this really old Premium bundle for $459.
There were no Xbox's on display, only a price tag for "Xbox 360 Core System".
I asked the cashier if they had any in stock, and she said yes, and went to the back room to get it.
It actually did NOT scan in at $159. It scanned in at $279.
The cashier flipped through some flyers but couldn't find it, so she took a look at the price tag behind the window, and changed the price for the SKU.
I didn't notice it was the Arcade version until I took it home. She put it in the bag almost right away.
Once I opened up the box and noticed the HDMI port, I took another look at my reciept and noticed it said "Xbox 360 Arcade".
So long story short... YMMV

There's no garuntee that you can get an Arcade bundle.