If you mean trading CS pets for something like that, it would not be allowed per our site rules;
You may not trade “off site” for things that are not analogous with Chicken Smoothie, such as content in video games, gift cards, or real world items
We don't allow buying or selling things for money because it requires giving the other person your personal information (usually, your real name) which we don't allow on CS. Physical goods would fall into this same category since its generally going to require both your real name and your address. There is a section in the art rules part of the site rules on this;
You are not allowed to arrange sales of real items to be shipped to another player.
All found
here.