Well, I wound up signing up for a promotion where it's $33 plus tax, plus modem rental $3 per month for 12 months (it would be $5 but we have our own wireless router so that makes it $3), then it goes back to the regular price. So I guess that's not too bad. We'll likely move after 12 months anyway.
Funny thing is, I think I've talked to about 10 different Comcast reps this week and got a different story from each one. When I posted before, none of them were mentioning the $33 promotion...but I saw it on a movers guide coupon (actually the coupon was for TV but I guess it works for internet too) and once I mentioned it, they were like "oh yeah, THAT one!"

If we do stay longer than 12 months, maybe we'll try something like Russsk said and have them turn on basic basic cable TV and see if they'll give us an Internet discount that way.
Now, let's see if the tech shows up for the installation on Tuesday! I think it will be a miracle.
Thanks all!