Best Suction Cup Material

Hi everyone!
I have a question that hopefully you all can help me on:
I have an application used for dry board erase markers (markers used in classrooms). Cutting to the chase, I have a mold made out of vinyl where I can insert the marker and on the back part there are 3 small suction cups also made of vinyl; the entire piece is a single piece made of vinyl. I need this application (including the marker) to stick on to surfaces such as: dry erase boards, glass, walls, etc... I went with vinyl because I thought it would do the job and of course vinyl is pretty cheap compared to other materials. Unfortunantely, I was wrong because the application would come off surfaces in hours and I need it to stay stuck onto whatever for a minimum of a couple of days. 
What material would any of you suggest I used instead of vinyl? Please keep in mind: the application isn't heavy at all and there are 3 small suction cups doing the holding. Also, price is an issue -- I don't need the best material that will hold this marker on a wall for a year but I do understand that any other material will cost me more than the vinyl.
I appreciate any of the help!!
Thanks!