Road Runner - Can i not walk into a sports store such as JD Sports abnd get running shoes ?
Also what do u you mean by gait ?
Sorry, I should've explained that.
Gait is how you run - how your feet hit the floor, whether there's pronation/over pronation etc. From what I remember, stability shoes work best with 'normal' feet.
You can definitely go into JB Sports or similar and get your shoes - but it's very unlikely they'll have any facilities to test your gait. Shortly after I first started, I went to the Nike store in Central London - they have a specialist running department. I had to run on a treadmill and they filmed it. Going by that, they recommended stability shoes - so I was all ready to buy them at their price of £80, but it turned out they didn't have my size in stock. So to Sports Direct I went, where I found 'em for £60.
I have seen documentaries questioning whether all these different shoe 'types' are necessary, but all I can say is this: When I first started out - before I'd gone to the Nike store - I went running in any old pair of trainers and always returned home with aching ankles, feet, legs - pretty much everything. Upon buying some proper running shoes, those issues disappeared - I noticed the difference on my very first run with them. 
Depending on how you feel about such things, you can of course go into a running store, have your gait analysed and then leave without buying anything - but that's taking the Michael a bit.
Now I know the shoe type I need, I always get 'em from Sports Direct because of their amazing prices. 
Edited: 05/08/2012 at 21:38