How about an advance?
Most all of them advertise the possibility of getting generous advances against your auction proceeds.
HA also has some terms in their auction rules that suggest that their employees and I think even the house can bid on items. Not quite the same as you had in mind, but maybe not all that different either.
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Trying to wrap up my master mays set, with just a few left:
1968 American Oil left side
1971 Bazooka numbered complete panel
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