Is there any way to buy balls more than one sleeve at a time? Is there any kind of quantity discount available? If so, how do you access it?
Yes you can buy more than one sleeve at a time. On the PC version after you click on purchase it will take you to a diffrent screen. On the right hand side it will ask "Packs to Purchase:". Just type in how many sleeves you would like to buy.
To the best of my knowledge they do not offer any discounts for more than one sleeve.