finding anywhere with stock of Hoka's is a nightmare - they're as rare as rocking horse crap - and even on line retailers (and there aren't many of them) have very limited stock.
you're best taking a punt on buying a pair on-line - if they don't suit, someone will snap them up on ebay. one thing - they do come up small so go a half or a size larger than normal. I love mine but I think they may be 1/2 size too small as my right big toe now has a black toenail from hitting the end