Dan posted about this deal on the main site. In the post he mentions using vcc's. . .
I think he means being able to bid with a virtual card (say, with $1 on it), so you can figure out what the lowest price on PL is instead of paying extra. Basically, you can bid $110, and if it behaves like it accepted your offer (by telling you the VCC failed), then you bid $100, then $90, then $80, etc until your bid is rejected. Dan can probably word it better than me

P.s. I just realized, from the wording of the offer it seems everyone who licks Like! at noon will see the same coupon code, which will have limited redemptions, meaning you'll have to use it on PL within a short amount of time or it'll expire. Not nearly as hot as a $70 unique coupon code, which you can use at your convenience...