Shoe Fitting and Measuring???

I walk about 3-4 miles everyday. Currently I am using just casual sneakers. Of course, they are KILLING me! They just aren't made for walking or jogging. The bottoms of my calves hurt like crap, its muscle aches. A friend told me that I should get fitted and measured at a running store, for my perfect fit. This is super expensive, and really outside of my budget. Do you all have any suggestions? Im going to buy new shoes, just don't know how to go about it, without dropping $150 for "custom" shoes. I plan on going later today, so any advice is helpful.

You don't need _custom_ shoes, and you don't need to spend $150. You just need shoes that fit well and have decent support for what you're doing. Many stores will fit you for free, and the best shoes for you may be $60 or less. $150 for shoes you have to change every three months is crazy unless you're a competitive athlete, have really unusual feet, or have more money than sense

I've had equally good luck just finding shoes with good support and then using athletic insoles. Dr. Scholl's has the foot-pressure analysis machines at places like Walgreens and Walmart. You step on their machine, it checks your pressure points, and then recommends insoles. I think mine are $30 per pair, but then you can use those in shoes that have worn in past the point where they would normally be giving you support, or use them to fix shoes you thought were the right fit but are not quite right, etc. They might even help make your casual sneakers less painful.