Old topic, but I wanted to reply in case anyone else is interested.
Aerogarden basically ships from their own website now, and through Amazon.
If you are living in the US, that is your primary sources for Aerogarden products.
If you are living in Canada, you can order directly from Aerogarden's website, but it will be a tad expensive because of shipping.
Canadian Tire basically discontinued carrying the Aerogarden in 2012, despite their website still indicating they do.
I've looked around and had some difficulty looking for kits and Aerogarden's for Canadian AG enthusiasts.
Around Ottawa, Eco-source stopped carrying the products, and so did a couple of hydroponic stores that I know.
Amazon.ca has a limited selection for Canadians as well. Shipping is where it will bite you a bit.
Used Aerogarden's can always be found on kijiji.ca
Two boards you may find useful:
http://www.aerogardentalk.com (formally
http://www.aerogardengrowers.com, still online but not accepting new members or posts)
http://www.aerogardenmastery.comIf you re-use your pods, and just need a refill kit (new sponges and nutrients), I'd recommend the following site.
http://indoorsalad.com/ Have a look at the 'Splasher' kit. You can use these items in your Aerogarden with your existing pods.
Bulbs is another tough one. Best idea would be to go on Ebay and search for 'Aerogarden bulb'. A seller named kidsdeco is always selling adapters so you can use regular CFLs.
Personally, I am a regular at Aerogardentalk. While I am not that great at cooking, I love fresh ingredients and gardening in general.
Stop by if you have any questions, comments or if you need any help.
HWJ