"He who marches out of step hears another drum." ~ Ken Kesey
yeah it sux ass!
First how many amp is the service your pulling. Your existing conduit may not be big enough for the run from the meter pan to the new panel, this may be jacking the price a bit. Just that run including wire, panel, four 3 phase beakers, ground strap, etc I'm willing to bet somewhere in the neighbor hood of $1k alone just parts, add $700-$800 labor. You may have $500-$700 in conduit, hangers, fittings, strain reliefs and boxes. I almost died a few months ago paying $100 each for strain reliefs for drops myself. Service cord for the two drops on the flashes $15 per ft plus a few hundred in wire for them in the conduit. Keep in mind each 40' 3 phase pull is over 160' of wire, 6 ga THHN is running $0.75 per ft now.
I would have to agree $8500 is probably in the ball park. Get another estimate though, can't hurt. I've got a friend with a machine shop and when they moved into their new building there was no 3 phase power and they had one lathe or mill that ran on 3 phase. The quote was somewhere around 9k from the electricians, IIRC. I did some googling and came across a phase converter. Not sure if that's feasible for you. Might not even be appropriate for a screen printing press/dryer. It was like $2300 for what we needed. Maybe ask an electrician if that is an option or talk to the support at Phase-A-Matic they might be able to tell you if it is possible.
Brett my dad was a general contractor down there for 40 years. I have several electrical contractors with solid reputations if you need a contact, let me know.
That is high for what we would pay up here. If I wasn't so damn busy now I'd head your way and we could knock it out ourselves! Get some more quotes. If you have time write up what you need with measurements and amperage draws, and you can email some contractors for rough estimates. What kind and size disconnects do you need? You are going to think I'm crazy, but my basement that I said held all sorts of treasures, well I got maybe 5 unused disconnects sitting on a pallet(I am not a hoarder, but I am a sucker for a deal). If I have any you can use, I'll add them to your shipment!
If you can do it, run the conduit yourself and pull in the wire, let the electrician wire up the ends so it's legal in your area. That's all labor costs your paying and really the work is mindless grunt work. It really is very easy todo don't hook up to the meter and there is no risks. I would run it myself and save $$$.