How about the poorman's fleshlight. You can make it with a blown-up 280q balloon, the kind you make animal balloons. With some clever twisting, you basically make 3 rings and hold the other side with some scotch tape. There is a small "ball" between the rings to accomplish this. (I know, a picture would help but I dont have one) Use plenty of lube and go. The best part is you control the tightness by making the rings smaller or bigger. I like to stagger them so the first is the loosest and the last ring the tightest. You could add more rings if your dick is longer.
The danger is if it pops. I never had that happen but then again I dont do this a whole lot either. It makes too much noise. Squeak, squeak, squeak.
I came up with it once when learning to make balloon animals. (just a hobby and a curiosty. I dont make balloon animals or was ever good at it) I made this catapiller which uses the 3 rings and the last step is to insert the remainder through the rings. (book I got from the library) Well, it didnt take long for me to substitute the idea of using my own "insert." Ahh, the male mind.
I will look for a picture.