I'm not sure if this is a new thing, but my local card shop just started doing it. Whenever a breaker has trouble selling the last few teams, this helps.
Say there were 4 teams left. Add the total cost and divide by 10. Now you have 10 cheaper slots. Everyone gets a random number from 0 - 9. If any of the 4 remaining teams hit, whoever has the last number of the serial wins the card. If there is no serial, that card is randomed between the ten. This can also be used in random team breaks, using the teams that fall in the slots of the random.