Buying only specific items from my iTunes Wish List

iTunes 11.0.2.26 on a Windows 7 pc.

I have a whole lot of items in my iTunes "Wish List" but I only want to buy two or three of those items now. What do I do?

Itunes only appears me to give me the option to:

a) buy ALL the items that I've added to My Wish List or

b) buy each item individually

If I go to Edit / Preferences and click the Store tab I DO NOT have the "Buy using a Shopping Cart" option.

How do I purchase JUST the items that I want to purchase now, without having to purchase each one of them separately?