There are several ways to make a purchase. You can go to the Apple Store, Apple.com or find an authorized retailer. Since we have no affiliation with Apple, we aren't able to help you with this purchase. Good Luck
Shop for the best price. Although new Apple products are usually not discounted, larger retailers like Best Buy often have a temporary price reduction.
0 percent interest 24 months!! Ram is serviceable in the 27 inch so spend more money else wear and buy ram third party as it is a cheap and takes 10 minutes to install. I went with the 3tb fusion drive. Fast and max storage.