TGT (Tight) Wallets is having a Father's Day sale (USA). Coupon gives 25% off entire order. With US$7.50 shipping to Australia this covered more than the postage to Australia for my single wallet purchase.
TGT came about through a very successful kickstarter back in 2012: https://www.kickstarter.com/projects/jacksutter/tgt-tight-a-...
They make very small front pocket wallets. Once you get used to one it is very difficult to go back (pun intended).