I order many of my oral motor items from Oriental Trading Co. catalogs. Make a line with tape.
Kids have to blow ping pong balls from the line into the cup.
You can make this easier with a cotton ball, harder with a golf ball. For the kids who can't tolerate them, there are alot of sour sprays sold in candy stores that are not as sour but do the trick. I have been to both of her oral motor trainings, and came away with useful ideas that have helped my students. I used Sara's horn and straw program. The straw program uses increasingly difficult straws to encourage tongue strength and retraction.