Ebay offers Apple Mac Mini MGEM2LL/A i5 4GB or 8GB - 128GB to 500GB HDD for $59.99 with free shipping. 

Product Description:
The Mac mini Desktop Computer from Apple is a quiet and compact desktop computer in a sleek aluminum unibody enclosure. The system, only 7.7" square and 1.4" high, is a great option for users who would like an inexpensive, yet fully-functional, desktop Mac. The mini ships sans keyboard, mouse, and monitor, allowing you to choose the accessories that best suit your needs for use with the system. The Mac Mini Aluminum MGEM2LL/A was released in late 2014 and features a 1.4 GHz Core i5 processor.