Do you have any recommendations? No promises, but this does sound like something I don't mind investing in if it can guarantee a better listening experience.
My earphones are
Etymotics hf3's (I like them a lot, but there are numerous good competitors). Etymotics has a program called
Custom Fit, where they basically play middleman, handle some of the paperwork, and get you a bit of a deal: through the program, you register your Etymotics earphones, get a certificate from them, make an appointment and take the certificate to one of their recommended audiologists, get the impressions done, and then they send off the impressions and a few weeks later you get the earpieces back. (Note, I did this a few years ago, the procedure may have changed since then). I've been very pleased with the result, and where the original Etymotics silicone tips gave great isolation but were kind of "shove this in until it touches your brain", the custom earmolds just pop in and exactly fill the space in
your ears.
But that's just Etymotics pulling together the various bits as an inducement to get people to buy their earphones. There are several companies that do the custom earpiece casting work (I believe
ACS was one, I don't recall the other names, sorry), Etymotics contracts with one of them. If you talk to the earpiece companies directly, they can recommend local audiologists and make custom earmolds to fit any of a variety of different popular higher-end earphones (that is, they have numerous earphone samples in-house to cast earpieces to fit - if you're getting earpieces to fit one of those, you just tell them which model and they handle the rest). (This is all based on recollections of things I read years ago when I first looked into it, so, uh, contents may have settled during shipping.)
BTW, if you want crazy good sound and just won the lottery, there are also companies that do a similar thing (though generally with hard acrylic vs. soft silicone), but instead of just earpieces for other company's earphones, they hollow out the earpiece and construct
amazing multiple-driver speakers inside - custom fit and stupendously accurate sound - you'll find a lot of famous musicians wearing these on stage in concert.
Westone and
UltimateEars are two of the companies making these, but I believe there are others.