Edited to add:
So I also posted this on Facebook and my friends erupted with questions about what it was. So I emailed it to one of my local Chinese friends, who got back to me right away, telling me it was a sea cucumber. A very popular ingredient in Traditional Chinese Medicine (TCM) which has properties that can help with any number of things such as low sperm count to frequent urination, as well as diabetes and being too skinny. I guess I better stay away from them, as my problem has never been being too skinny! You can read more about them here. And now that I know what they are, I can tell you that I have seen them in a dried state quite a bit around Macau and Hong Kong, where pharmacies that specialize in TCM are on every corner, with their wares on display in the window. I'm not sure about the trampoline though. Maybe in addition to everything else they make you want to jump for joy? You can buy 500 grams of it for 7600 RMB (about $1,270 USD) according to the ad.