The Law School supports both Windows and Macintosh. Get price quotes from a good cross-section of sources for informed choices. Check all quoted prices again before ordering in case any of the prices have dropped. When you buy directly from a manufacturer, they will custom-build your laptop with the hardware and software you want. If you mail-order a laptop, find out how long it will take to build and ship it.
Some companies promise next-day delivery.
If you don't check, it can take anywhere from 4-6 weeks. Find out where you can get the laptop fixed if something should go wrong. The U-M Computer Showcase on the ground level of the Michigan Union also sells computer hardware and software at educational prices. Their web site provides links to various vendors so that you can do some price comparisons. You can purchase computers from stores, vendors and manufacturers.