Teresa, I have purchased 2 different types of toy hooks online. One I absolutely ADORE but I cannot find the link to it tonight, it is powder coated, heavy duty, attaches to the side of the cage and hangs well above the playtop.
I bought 2 of the good ones about 5 years ago, needed a couple more and lost the link, I found this link I'm about to give you and bought these instead-I'm posting to let you know-DO NOT ORDER-you will not be pleased. These are very thin and flimsey. The bottom part is sharp and will cut a bird. But the main thing is that the hook will not stand up, it falls over! I ended up throwing them away they were so bad. Here are the ones I do not recommend.
http://birdcages4less.com/page/B/PROD/PA5762 The fantastic ones are from a cage company called Feathersomething I believe. They are about $15 apiece but well worth it. When I rediscovered them again I bought 4 more and have used them all up-on playgyms and cages. I need more now-LOL.
I have to work in the morning, just got up because I couldn't sleep and read your post. I will look for my invoice from them when I come in from work on Sunday evening and post it. You will be very pleased with them-I promise. Bren