So I had an online credit at Hockeymonkey that I received back in March for some returned Easton protective equipment that didn't fit quite right. Since then I couldn't really decide what to use the credit for as I was pretty happy with all my current gear. I have been using the Warrior QRL4 for around 8 months or so and have enjoyed them quite well but I have been hearing raving reviews of the Alpha QX here and elsewhere, so I decided to pick up a QX3 W03 85 flex. Haven't used it yet but will this Sunday at practice. Pretty sure I will love it. It's a gorgeous looking stick as is almost always the case from Warrior.
Pure Hockey sells them for $3. If you're shipping them full and for sale, might be worth it.
If you're sending back a broken stick, companies allow you to cut them in half so that you can fit it in a smaller box.
I just keep boxes from purchases. Also, you could fashion one out of a normal box. Also, you could just wrap stick in thin bubble wrap and then use a trash bag and packing tape to protect stick.