DINK WHISPERER

I get mine right from Shimano at https://fishshop.shimano.com/
I actually got the Curado K 200 XG handle on some of mine. It's slightly bigger than the XG Met at 96mm instead of 95mm. It's $15.80 for the whole assembly with power knobs vs $38.55 for the Metanium assembly. You'll just need the chrome end caps or "knob seals" since the Curado knobs come with black end caps. 
Also, the Curado handle matches the Metanium body color better as well. If you purchased the 6.2 or 7.1 JDM Metanium you got the tiny 84mm handle. If you purchased the XG then you should have a 90mm but the knobs are still tiny and not the power grips.
Let me know if you need help with part numbers.