Personally I will go down to the craft store, they have a two part modeling putty (usually yellow color), a little vaseline on a Q- Tip swab the ears. Then mix the two part putty, throughly, then slowly push in to your ear. Get a small piece of bent wire with a loop in it, to tie a twine to at the end of the process. Insert the hooked wire into the putty about a 1/4" while putty is plyable. Let set in ear 15 min then remove.
Made up about 4-5 sets, one in the console, one in each pack or gun case or bag. That way I can not forget them.
PS the putty kit is about $35 dollars. Putty is very similar to the density of that of the professional custom sets. Been using these for about 15 years lose them from time to time just make another pair. Shoot skeet quite a bit, use these under the muffs when at indoor ranges.
Should be well with-in your 150 dollar budget.