When I thought you can't get the Frame Arms #S01 NSG-04θ Weisheit θ easily at eBay. Well, I finally spotted one store known as Hobby Locus and decided to grab one from them. The seller is safe to buy and mine already arrived in my post!
For your information, it is still available at their eBay store. The price is quite reasonable and almost the same price sold in Japan! But remember this is eBay, price will eventually go up in time! Happy hunting guys!