If you dont want to buy the armor/weapons that already have the enchantment on them, try some of the "Dark Brotherhood" quests. I have found a few items that have the enchantment on them.
Make sure you increase you increase your Alchemy/Enchanting/Smithing skills so that you pratically have overpowered armor and weapons (Smith weapons,Enchant them,Improve them). Get that mixed up and you can have about 10-??? damage,armor,rating etc...drop and be lost from that peice of armor and or weapon!
Why would I make sure to do that when I go out of my way to avoid doing it? People complain about imbalances in the game then go on to exploit them. Is the game too easy after spending an hour and a half getting your daedric warhammer to 2000 damage? Quite simple: don't spend two hours powerleveling and exploiting imbalance.
I've never made a character that uses smithing and enchanting both. Only things I smith are rings and amulets to enchant and sell.