There are a large number of specialty retailers that sell these shoes. However, as you did not specify your sex, or the area you live, I am unable to point you to a physical store.
mizunousa.com is the best online place to shop for mizuno shoes. The website also has a contact page where you may call to see what stores carry their shoes specifically.
You can buy Mizuno walking shoes in your local sporting goods store. If you prefer to shop online, you can find them at amazon.com, rei.com, and runningwarehouse.com.
Mizuno running shoes can easily be purchased online at Zappos.com. Mizuno also has a online shop that delivers and various shops all around the country.
You can purchases Mizuno shoes online at the websites MizunoUSA.com, www.NexTag.com/Mizuno-Shoes, and www.onlineshoes.com/mizuno-b_id97.
You can find Mizuno Wave Inspire 6 shoes and reviews for these shoes on the Mizuno website also on Amazon.com they have sellers there for these shoes with reviews from different people.
While you could certainly purchase directly from the manufacturer (Mizuno), there are a number of online stores that also sell the Mizuno Creation 13 shoe. One of the more popular online shoe stores, Zappos.com carries the Mizuno line. Other online sources include Amazon.com, Finishline.com, and Footlocker.com. Having a variety of options of where to purchase your shoes allows you to shop around for the best price.
You can find Mizuno Wave Creation shoes on this website, http://www.nextag.com/mizuno-wave-creation-shoes/shop-html. They have a variety of colours and sizes at affordable prices, while also featuring a review section to see if they are good shoes.
You can buy Mizuno running shoes at any local sporting goods store including MC Sporting Goods, Dick's Sporting Goods, Dunhams, or even at the Mizuno outlet or retail store.
Go online to Shopbot.com. The stores listed are Chain Reaction Cyles, Slashport Shop, Wiggle, Sports Lab & Trekkinn.com. The cost for these shoes is $112.73.
You can get them on the Mizuno website - http://www.mizunousa.com - but other websites sell them as well, including runningshoes.com, finishline.com, sportsauthority.com, and general sales sites like Amazon and Nextag. If you'd like to buy them in a store, you'll have to do some searching, but they are available at certain sports stores as well as department stores, including Nordstrom.
The best place to search for information on Mizuno Wave Creation shoes is to go to mizunousa.com and search under the 'shop' tab for 'running.' This will guide you to all of the shoes offered and you can see which one will be suit your needs.
It all depends on how your trying to purchase them. If online I would recommend amazon.com or even eBay but if its a shop I would say footlocker or even shoe carnival.