True that the sodaclubusa code RAD30 is expired, here are a few useful codes, that as far as I can tell, do not have a determined expiry date, all of which I have used in the past. (I use KSE10 most frequently.)
KSE10 (Kids for Saving Earth 10% discount) - Takes 10% off the entire order - Often times cheaper than the seasonal "discounts" they run, for ordering the kits. (That is not the case with the sodaclub penguin, its seasonal "discount" code is cheaper there). Also handy in the case of reordering supplies. In the case of reordering at least $55.56, this discount will cancel out the $4.99 shipping charge for "reorders above $50".
FREEMIX - Allows you to add 1 soda mix to your order free of charge.
CHEAPGAS - Allows you to order spare carbonators at refill carbonator pricing.
I do indeed like this machine for making my own pop. Also, Compared to store bought diet soda, I actually prefer the soda club diet soda, taste wise.
Also, they do indeed ship this to some parts of Canada. (BC for sure, as I live in that part.) They however do not ship to alaska or Hawaii.