Q: I was hoping you might be able to tell me a little more about this book, Thoughts of Marcus Aurelius. It caught my eye at a garage sale, and I picked it up for $2. I was curious about what time period it was from, and if it has any particular value.

A: Your book was published in 1902 as part of the Vademecum Series.
It originally came within a labeled box
See: http://www.henryaltemus.com/series/series180.htm
In my opinion you paid a fair price.