Come on, now. A quarter pound of #64 rubber bands costs $2.99. That's about 100 rubber bands.

Tower Hobbies sells them. They will bundle three boxes of a quarter pound each at $8.58. That's around 300 rubber bands for under 9 bucks. Oil soaked? Throw them out!!!
Besides, most people use them once then throw them away. They will stretch to the limit, then when they get oil soaked, they are basically useless.
CGr.