Thanks for the reply Nophead! I feel silly now that I have seen the reprap wiki page on
stepper motors... It clearly shows the SY42STH47-1684B as being recommended for Mendel. I went ahead ordered up 5 of these, today, from Zap Automation. I figured I would pick up an extra one just in case one get fried or I want to add a second extruder to my machine. Total price with shipping to Washington State was, $136.66 US Dollars. Zap Automation was definitely cheaper than Ebay!