The options shown depend on your funcom points amount, too.
For example, if you check a social armor costing 150 points to buy and 200 to unlock:
It will show "buy funcom points" if you have less than 150 points, only the buy option, if you have 150 to 199 points and both options, if you have more than 200.
But be aware, that the option to unlock is only available for social gear for now.