Yeah, as Milt said below - molded ear pieces are a bit on the expensive side. A pair of the cheapest Ultimate Ears in-ear monitors would run you at least $400, and I'm not sure that includes the audiologist fitting. Although at the NAMM show Ultimate Ears were taking molds on-site for free with your purchase as part of a promotion.
A lower priced possible solution could be the Shure SE215 or SE315 in ear monitors ($99 and $199 respectively). I use the SE315's on my gig and they isolate me just enough so I don't have to crank the in-ear volume.