Most audiologists can take molds and place an order for you. Most seem to deal with Westone, but there are other companies such as Sensaphonics and ACS Custom. The latter two use a softer material which I find more comfortable, but seems to wear faster.
They are typically around $200-$300. You are expected to re-mold and replace them every 4 years as the ear canal tends to change shape.
Keep in mind that every earplug will have some level of occlusion. Using them as intended, in loud environments such as clubs or industrial jobs, you won't notice this. Us with bad tinnitus use them on lower volume situations which tends to accentuate it.
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