Purchase services
Even if you generally purchase your licenses through a CSP partner or reseller, Microsoft will still offer you the chance to buy products directly from them on this site.
Believe us when we say that this creates no end of opportunities for confusion.
Avoid doing this. If your company's buying through a distributor or CSP, you are probably getting a better deal than what Microsoft offers directly. They've actually rigged the incentives so that distributors can offer a better deal than they do, because they'd rather that partners and distributors do the selling; Microsoft isn't famous for its keen interest in support and customer service for large numbers of inpidual consumers and small business users:
Purchase services page
Of course, if you are purchasing directly from Microsoft, there's no reason not to use this site to purchase products, as long as whoever authorizes spending in your company has given you the OK.
Each carat by a suite listing (such as Small Business Suite, Enterprise Suite, Dynamics 365 Suite, and Other plans) expands so that you can see the full listing of all the products for sale in that category. Most products require an annual commitment if you're buying from Microsoft, so be sure you've got funding secured for a full year.