Alright, I've been email/calling around and have some good info to report.
The Cobbler (Vancouver) got back to me and said they do re-felting for $180 +gst AND YOU HAVE TO SUPPLY YOUR OWN FELT! Ya, I'm serious. Give that that guy a miss. Jesus.
Didn't really have any other luck finding a cobbler that will do the labor work for you. As others have said, seems like a job no one really wants to do any more.
However, I got a hold of Daniel K. and he told me how to do it yourself. Does not sound that hard. Basically,
-Remove/sand the old felt off as best you can. You want a flat, clean, dry surface. He said no big deal if a bit of the old felt remains as long as it is stuck on really well and is clean/dry.
-Stuff rags in the boots so they'll hold their shape when you tape the crap out of them after.
-Good coating of E6000 glue on the felt and on the boot sole.
-Glue it in place, then tape the crap out of the boot with packing tape. Leave to cure for a few days.
-Remove tape, trim felt as needed with a box cutter
-IMPORTANT: after the felts are glued on and cured, go around the entire perimeter of the sole, and apply a coat of glue to the edge/outside of the sole, where it is adhered to the boot. Let that dry/cure for a day or two.
Dan said he just buys/uses the felt insoles from Mark's. They are about $12 for a pack of 4.
I plan to give this method a go on my older Simms Guide boots. If my glue job holds, I'll buy some more expensive felt and do my G3 boots. The felt insoles from Mark's look like they would shred pretty fast IMO. However, Dan says because it is softer felt, it bites REALLY well on wet slimey rocks.
As far as "more expensive felt" goes, Searun has some on their website that looks pretty good/thick for around $80 plus tax. I called Simms and they sell the OE felt for $80 USD and will ship it to a US postal address. The guy on the phone said it is the same as the OE felt, which IMO is far superior to any 100% felt you can buy in stores in Canada.