Even if you don't buy that company's stamps you may get ideas from the examples. Always ask before taking photos of the examples, there may be copyright issues. If you're staying over night bring a few basic stamp supplies with you since you will want to use your toys right away. Unless they are very patient you may feel rushed as you try to look over the items. Popular booths may become crowded and an extra person or two may hinder you.
Some conventions have a waiting area for companions.
Remember, compare prices, since many companies have similar images and carry similar accessories you may find something cheaper just a booth or two away. Some vendors maybe offering specials don't be afraid to ask them. Stop at the front entrance and see if you can get a map of who's where. Take a few minutes to stop and see where the vendors that are the most important to you are located. When you first enter the selling area go to the left if possible.