Sigma seem to be having a sale and their Lens are down to < Y 10,000 on Amazon.co.jp
Seach for the product code 30mm or 19mm Sigma EX DN SE (SE for Sony E-Mount).
They make Micro4/3 mount lens as well (search for MFT insead of SE)
You may need to 43mm to 49mm step-up convertor, or buy a simple Tiffen 43mm UV lens filter.
Shipping for the combined package is about $25AUD (including handling/consolidation charges).
The Paperwhite thread has help setting up the account if you can't read Kanji.
How can i check sigma for pentax k mount, im after cheap pancake or fish eye lens (ultra wide)