$1 will surely get rejected but you are not far off. Ive noticed
that you can learn to beat the computer of Priceline rather
effectively.
When you put in a lowball bid, it will suggest a more realistic
bid. For example, you want a rental car for 4 days and you throw in
a $30 bid for the whole time. It will suggest something far closer
to their normal rate - say $120. Keep your lowball bid but maybe
bump it like $5. Submit it - it will be rejected. Go back in and
readjust the timing - say you wanted to pick up your car at 11a,
pick it up at noon. Adjust the bid nominally higher, say to $50 -
chances are you will get it. The system seems to favor rebids and
will gladly award lowball fares. That's my two cents.