I’d like to have bought all of them, but I made a small selection in my mind.

 in my mind：在我脑海中；在我心目中；在我心里。

这个并列句中的两个分句，都是描写心理活动，并没有实际购买。最后的情况是，只是在内心中挑选了一小部分。

【翻译】我本想把它们都买下来，但我心里只挑选了一小部分。

一言助记各种各样的mind，希望背诵。

If you make up your mind to do something, you decide to do it.

If you change your mind, you change a decision you have made.

If you have a good mind, it means you are very clever.

If you have a mind to do something, it means you want to do it.

If you keep something or bear something in mind, that means you remember it.

If you have something in mind, that means you have a plan about it.

If you close your mind to something, it means you don't think about it on purpose.

If an idea never crossed your mind, it means you never thought of it.

If something comes to mind, you think of it without making any effort.

If you lose your mind, that means you become mad.

If many people are of one mind, they all agree on something.

If someone is out of their mind, they are mad or very foolish.

If you put your mind to something, you start making an effort to do it.

If you can read someone's mind, you know what they are thinking without them saying anything. 

If you set your mind on something, you are determined to do it or obtain it.

If you speak your mind, you say firmly and honestly what you think.

If you are of two minds, you are uncertain about what to do.

If something sticks in your mind, it remains firmly in your memory.

If something slips your mind, you forget it. 

If you don’t mind, I’ll stop talking about “mind”.