Well your experience with the cheap Canadian Tire gun is about what you can expect from a cheap gun, not worth the money.
You CAN NOT import a gun from the US or elsewhere it will be seized and worst case scenario you are charged with illegal importation of a restricted item.
Unfortunately airsoft is not cheap to get into your best bet is to fill out your profile completely with your location and age, you realize airsoft is restricted to 18+. Get age verified you will have access to the classifieds forums and you may find something in your price range.
Also read the FAQ all the information you seek has been talked about many times over and can be answered there.