Marvel: Five Dollars to Buy a Space Gem

How to survive after traveling through time and being a beggar for a whole month with only five dollars left in my pocket. What? Has the system finally awakened? This scammer is actually trying to sell me something? What? Five yuan for a space gem? It doesn't seem to be a trap! Come on, let me buy a precious space gem, steal Howard's strengthening serum, and grab two Pym particles along the way. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.