I dont know a free place but the princeton review puts out a book called "medical school essays that made a difference" Its an amazing collection of PS, probably the best ive seen. Most PS books make the mistake of putting thepse absolutely ridiculous applicants essays in. For example, one book only put in students who were accepted to duke, UCSF, harvard, etc. THe point is books like those arent representative of what a normal applicant is. The princeton book has a good collection of essays from more normal applicants who dont have a 3.9 and 41 mcat and werent able to save a small african village by themselves while finding an ancient mayan artifact in the jungle. 😉
Oh the book is cheap too i think i got it for liek 15 bucks of amazon