Not that it's any of my business, but why would you waste money on something like that ? It's only a matter of time before fatigue is as good as out of the question anyway. The only enchantments i ever used were the constant effect ones, like fortify strength for instance. But that's for later in the game when you start finding the good gems and occasionally run into Golden Saints and Ascended Sleepers or whatever you call those weird creatures.
But suit yourself, if you want to know how much it cost, make sure you have a gem with a trapped soul in your possession, take it to an enchanter, place the gem and the item to enchant in the designated slots, and the price will be revealed to you.
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