Roll your own foamies?
I did this for my e2s and my e4s until Shure offered up the black olives.
You'll need the following stuff:
Industrial Ear Plugs. I used
Howard Leight Laser Lites. I also tried the foam ear plugs from Wallyworld and found little difference in the sound.
A precision straight blade screwdriver with a Little smaller diameter head and shaft than the shaft of your IEMs. (come'on all you guys, break out those calipers!)
2 small lengths of Silicone Hose. I used fuel line from a R/C hobby shop. You'll want the Inside Diameter of the silicone tubing to be slightly smaller, not a lot smaller than the outside diameter of the shaft of your IEM. Friction is what keeps the silicon hose onto the shaft. Pressure from the foam squeezing the hose onto the shaft helps as well. Length shouldn't be much longer than the shaft of the IEM.
A razor blade, the sharper the better. I always used brand new utility knife blades.
This is how I did it.
Lay an ear plug on its side so you can use the razor blade to cut off the "flared" or Fat end. The more plumb the cut in relation to the plug the easier it is to stab. I "sawed" the razor blade back and forth. I found it easier to slice the ear plug without compressing it.
Now, Stand the foamie on its end.
Then "drill" down the center of the ear plug with the screwdriver, spinning the screwdriver in my fingers. This cuts a way through the foam as well as smashes the center.
With the foamie now in doughnut shape, I push the screwdriver through the earplug so its on the shaft.
Now slide a length of silicone hose down the shaft the screwdriver.
Now, squeeze, mash, swear and try to pull the foamie away from the shaft far enough to slide up over the outside of the silicone tube.
now slide off the silicone tube with the foamie and viola!
Just a note, I never glued the foam to the silicone and I never had them come off the IEM or off the silicone tube and I used them A LOT.
So pick the size of the screwdriver carefully, as well as the size of the silicone tube.