I hate when people do this, also I think it doesn't work on anyone from my generation. That was part of my reason for choosing Sonic.net.

Which country do you live in ? I know nobody does ISP introductory prices in France.

Ryanair, too. They will fly you to $MAJOR_CITY* for just €0.50†!

* Where we actually mean "a smaller airport 150km away from that city and you're on your own for getting to it"

† Plus €20 ticketing fee, €20 payment-processing fee, €20 boarding-pass issuance fee, €20 checked baggage fee, €20 carry-on baggage fee, €20 fee for no baggage, €20 plane-boarding fee, €20 airport use fee, €20 fee-handling fee and other additional fees as indicated in the terms and conditions

With EasyJet I've always paid the advertised price, give or take a couple of £. As far as I'm aware they don't have any "first-time flyer" discount rates.

I checked out the site for Cox, my local cable company. For TV, they advertise $49.99, and above that in smaller letters it says "prices per month for 3 months, starting at." If I click "Find Out More" below the price, which it seems is required to get any details or sign up, it then gives me several plans whose prices are "for 12 months with 2-year service agreement." If I keep poking around I can finally view the terms of the offer which says "Bundle rate increases $15/month for months 13-24."

Certainly not great. But at least it's reasonably clear that the number they give you isn't the full story, even if finding the real one takes a bit of legwork. Not trying to defend them, but this helicopter thingy is a bit worse.