There are tons of good online stores in North America.
For Phoenix checkout:
1)
www.westcoastdiecast.ca
2)
www.jetcollector.com
3)
www.eztoys.com
4)
www.wafflecollectibles.com
EZtoys and WestCoastDiecast will give you free shipping in the U.S. for a large order (specifics on their sites).
If you are also going to get Aeroclassics in the same order then I'd consider EZtoys or JetCollector as they are the only retailers in the U.S. that carry both brands (saves on shipping, again EZ will give free shipping on large orders). They also give 10% discount with codes to site members who are signed up for their mailing lists (ask for more details).
WestCoastDiecast has a good loyalty program for registered members also.
Then there is Waffle, he also sells "cheap" Phoenix. He
might yell at you
if an issue arises, otherwise he is pretty reasonable, but if so don't take it personal, just tell him to go yell at his cat, take the refund, and go to West Coast Diecast or Jetcollector. No free shipping, nor discounts from Waffle.
They are all reliable stores.
There are some other good, reliable, retailers that sell Phoenix, but they tend to run more expensive due to the distributing company they use.