You can bid on any lot once it reaches 1,100 credits... I basically start the lots at 499 to cover a 49 cent stamp, because World stamps are $1.10, I ask that the bid be at least 1,100... However, if there is ever a lot listed that you are positive you will at least bid the minimum, contact me so I can change the starting bid to 1100 and you will at least be able to bid...