If we are using the
Popularity List as a reference, for Tier 1 villagers the price range would be something between 10-30 mil IGB;
so, with the current 'exchange rate' for IGB to Forum Bells (at 10 mil:100 btb),
that would translate to 100-300 BTB.
With the villagers' pricing on a one-way downward spin in the past 10 months or so,
I'd say the safest would be
150 BTB, as quite a bit of cyclers are also setting Tier 1 at that range.
Unless you are putting Molly up for auction on the very day that several ppl are desperately seeking her,
and you are hoping for a bidding war, I would be really surprised to see Molly reaching 300 BTB. ^^