You've probably found most of the same things I have on this site, but I found this from several years ago this AM:
You don't need to buy fancy forms to do the ears, I use pipe insulating foam. You can get it at most hardware stores in the plumbing aisle, Home Depot, Ace Hardware, etc. You will also need Johnson's Sports Tape, you can purchase it at Walgreens, make sure you use Johnson's, I have tried other brands and gotten skin reactions, never with Johnson's. If you intend to glue, you will need to purchase a can of skin bond, or I believe it's called "Osto Bond" now, you can usually find that at any medical supply store, some pharmacies also carry it, but you won't find it at the drug store (like Walgreens or CVS). You'll also want to have an exacto knife available. So, to begin with , you will want to take the foam and cut a piece the length of your dog's ear, making sure you cut it long enough to fit down into the base all the way to the tip of the ear. Coat the back of the foam with the skin bond, also coat the inside of the ear with the glue. Firmly press the foam into the ear, making sure you get it all the way into the base, smooth the ear around the foam. Now the tricky part, you'll want to cut the foam with the exacto knife to the shape of the ear, so when you're done, the dog will just have a piece of foam glued to the shape of his ear, not a big round piece hanging in there. (wish I had some pictures!!) Next, use the sports tape and wrap it around the ear to secure the foam, it will be itchy while the glue is setting, the tape will help secure it for a couple of days. I always like to do the other ear as well, even if it's standing, them brace them together while the glue sets up. So for the good ear, you can use the foam, cut an appropriate length, use the sports tape and run it down the foam, then turn the tape so it's sticky side out and wrap it back up the other way. Place that in the dog's good ear and wrap the ear with tape. Now you need to cut a longer length of tape, start at the base of one ear with it, go accross the top of the head and wrap the base of the other ear, back accross the top of the head to the 1st ear, this braces the ears together. Make sure you are careful with the set of the ears while bracing, don't pull them too tight together so they'll be overset, try and get them in a natural position. You can also add another strip of tape on top of the 1st piece that's at the base, just to make sure it holds. I will usually keep the tape on for a couple days, just to make sure the glue is set. You can then remove the tape and form from the good ear and the tape that you have around the bad ear, the foam will remain glued in the bad ear for several weeks. Just watch that he's holding the ear properly on the head, if he starts hanging the ear, you will want to brace them together again. Also, try and have someone available to help you, you will definitely need the extra set of hands!!! Good luck, I have been taping ears this way for over 20 years with good success.
I've been running around like a chicken with its head cut off, buying every product which sounds promising. Tape didn't come today. Will let you know.
I tried the Breathe Rite strips early on with no success, because Trappe's ears are so large and heavy. However, I didn't think to glue them in or to use multiplex in X patterns or whatever. I may also revisit that, perhaps in combination with the Dr. Scholl's molefoam padding, if the other doesn't work.