If by samples you mean stock available at suppliers booth that can be bought right away, then the answer is yes. Some suppliers at jewelry and kid’s toy section, for instance, offer stock that can be bought in several pieces or a dozen per style. You can take as much little stock as you like to see how it sells.
Unfortunately not all suppliers keep stock; many of them only display samples on shelves and make to order. If so, you may have to look for another supplier who is willing to sell sample.
It’s not uncommon though when some suppliers think you’re potential big customer they are lavish at offering samples.