Looks like the Cheerson CX-20 (APM Open-Source version) is still for sale.
If you are still flying this nice little brushless quad-copter, now might be a good time to pick-up another RTF package. You will get a spare battery and lots of spare-parts (landing-gear, body shell, motors, ESCs with LEDs, APM-FC, etc.).
Shipping from USA-warehouse will likely be pretty quick.
8% OFF Coupon Code: bggcx-20 (special limited-time code for CX-20 Quadcopter)
If this is your first CX-20/Nova, you might want to read my blog's archives for tips. Like ... throwing-away the included cheap battery-charger (and buying yourself a "real" LiPo charger for $30 usd) :) The LiPos for your new hobby will thank you.
Right after I posted this, I found another tip posted by DKEmxr in the forums. Looks like HobbyKing still has some Nova's left as well. It's the PNF package (no battery or radio) but it's only $129usd. Remember that the Cheerson CX-20 is the quad that HobbyKing cloned to make the Nova.