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That's a fair estimate for the labour, although an electrician might want more per day. They are also going to want an RCD protected circuit and an isolation switch so that could add to your material costs. Ideally you'd want 3 people, a core drill specialist, tiler and electrician. That's not going to work on such a small job unless you happen to have 3 mates who do those jobs. Having said that, I've never tried to core drill a tile but it might work with a diamond tipped core bit and slow speed, they will crack easily though.
I've drilled some reinforced concrete walls for kitchen extractors, that is a days work. The pro's who do it all the time suffer from white finger where you lose circulation in the hands, it's quite painful.
Airhead
What Airhead said. Very good advice.
I hired a core drill myself which came with an isolation transformer. It's a tough bit of drilling depending on your wall construction. Took me maybe an hour or two on a Victorian brick house.
I'd get a fan instead of using a dehumidifier. Envirovent Silent 100 works quite well for me. You want your bathroom door to have a gap at the bottom to allow ingress of air.
Someone might suggest getting a fan above the shower head, but often this is not an easy solution.
No idea how much you'd pay to have this work done, but if it were me doing it (and I'm slower than a professional tradesman), I'd want a full day's pay, so something like £200 - £250, I guess.