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If you are willing to spend a little money there are flybeds. But then there are bungee trampolines. Personaly i like the bungee trampolines because i can do quads and it makes me feel like i can actually be good at skiing. The downside to bungee trampolines is that you can only spin forwards and backwards but that doesnt matter as long as you can huck quads. They are also a tadbit inexpensive. I would highly recommend a bungee trampoline to practice your future spins.
I have never purchased a trampoline in my entire life and I own 3. People love to get rid of them. Talk to your friends and people that no longer have kids and tell them you will remove them from their yard. Most Adults hate them therefore removing them from their yard is considered beneficial. I have a crazy setup on a hill side step up, step down, and tree plants. I did a lot of dirt work, but it is worth it.
if your looking for a really bouncy cheap tramp, get an octagonal one. i don't know what it is about them but they are twice as bounce as a conventional circular trampoline. also don't get anything more than 14 feet wide cause 15+ tends to be less bouncy. unless you have $20,000 to spend on a super tramp. but i doubt that