In solo play:
a. (not so easy) have a deck with total cost in coins of $35+ when shuffling for the first time during clean-up of T2.
I can reach $39:
Shelter game (initial deck worth $3):
T1: play CCCCC + baker coin, buy Stonemason + 2 Nomad Camps (worth $10)
T2: play Necropolis, Nc, Nc, C, C, buy SM, gaining 2 Peddlers, buy Peddler. (worth $26)
Total: $39