A semi-easy way to make some cash is selling fossils! Just get them identified by mailing them to the museum, then sell them to tom nook. They are usually around 4,500 or so bells each. (some may be more or less than 5,000 bells). If you get 3-5 fossils per day, you will get some money fast.
*NOTE* it takes 1 day for the museum to return your fossils.
*OTHER NOTE* I have noticed in my game that after a while the fossils seem to cost less. I don't know if this is because the fossils that I'm selling are the inexpensive ones or that over time fossils start to be worth less.
Added by: gcman07 Apr 12th 2009, ID#8809