This article is from the Polyamory FAQ, by email@example.com (H. Wilper) with numerous contributions by others.
It's a newsgroup joke referring to the occasional post from
someone, almost always identifying himself as a straight male,
who is seeking "hot" (i.e. sexually arousing) bisexual female
partners to save him from the monotonies of the back rack at his
local video rental shop. The term Hot Bi Babe is almost always
used sarcastically, occasionally by those of us who really are
hot bi babes, to lampoon those who regard our sexual preferences
as a spectator sport. (Our crankiness has more to do with the
frequency and ineptitude of clueless approaches than it does with
the acceptability of fantasies or anything like that.)
(and where can I get some?)
Posting personal ads to alt.flame is usually a good strategy;
alt.dev.null is another good bet. Best of luck, and keep those
cards and letters.