SE did their latest Legacy prices drop last night. Prices are becoming more affordable on legacy worlds, though there's still a long way to drop.

The cheapest small plot is now 12M on NA legacy worlds. That's about 800k gil per member of a 15-member FC. The medium is 45M or about 900k each for 50. Large is about 1.5M each for 100. (Double these numbers for JP legacy worlds.)

The bottom (mid-March) would be about 132k/150k/250k each at the above numbers of members, but I think most FCs will decide to purchase weeks before that. New listings would start at twice that amount, or 8M/30M/100M for cheapest S/M/L. These numbers apply to both NA and JP worlds.

These numbers don't take into account the "all worlds" pricing adjustments SE is already considering.