All items can be enhanced, but the success rate is really rather dismal without using Perfect Red Miles and Perfect Blue Miles, which are in the game's cash shop for purchase. Personally, I wouldn't bother enhancing weapons until you're at least in your 40s, possibly higher. I didn't use an enhanced weapon until 60 and I've done just fine.
As for prices of the items, I'm on Teva, and our economy is different than that of Bijou. Hopefully someone on that server can help you out.
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