I know we've discussed this before, but I can't find it either.

I thought there was something for Minnesota Lakes, but all I can see now are the Mapsource US Topo (1:100k) and US Topo 24k National Parks (1:24k, includes BWCA coverage) that would meet your needs, from here...
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PS: if all you want is BWCA maps (&poratges, campsites) on your 60csx for your trip, I think you could get someone (local QJ friend?) who already has Mapsource to load it for you, but I'm not 100% sure about that.

-Tom

PPS: This is the Minn Lake thing... I don't know how good it is.
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WW: Given your timeframe & travel plans, here's my suggestion:

1) Buy Garmin Topo US (or the 24k park one or the Minn Lake one)

2) Read the directions & load the desired detailed topo maps onto your GPS (don't plug the USB in until you've read the instructions! Drivers need to be installed first!  With my GPSMAP 76C is seems like it needs to be plugged into the same USB port also. That's how I learned how helpful Garmin tech support is! )  --- most of the work is finished, but important details remain.

3) When you get that far I'll e-mail the BW portage & campsite stuff is on Azalea's site in Mapsource format (get the .MPS files from the link below) .  Get those, load them into Mapsource & then you can load (a subset of) those onto your 60csx.
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-Tom