I heard that this year size 64 rubber bands would be allowed, but they are not available for purchase from vex. So i was wondering if they will actually be legal this year and if so will we have to buy from another source.
Yes, #64 rubber baners are new official VEX EDR product, thus are legal for use in VEX Skyrise, along with identical replacements. You can find more information on these rubber bands here.