Building my brother a computer. What parts should I get him?

I keep getting this when I look at my parts list

(part) has been removed from shopping cart due to quantity limitation/insufficient stock. Some combo items might be affected by this.

Why? When I go to the parts page it says its still in stock.
 
Now My 1 TB hdd, gigabyte MoBo, and i5 CPU are unavailable. It says they are still in stock so whats going on? can you find me parts similar to the ones that are gone?
 
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