Telscope eye piece

What lens do I get to invert the image on a Meade DS114?

Eyepieces are for the most part interchangeable. Your scope will have a focuser on it in one of 3 diameters. 2", 1.25", and the rare .965". Most inexpensive scope will use a 1.25" eyepiece. 2" focusers are usually found on more expensive scopes used for astrophotography due to the increased field of view with the larger diameter. Plossl eyepieces are fairly inexpensive and are good for all around use. I would suggest getting 2 one at 25mm or greater and one around 9mm. http://www.telescopes.com has a large selection however their are many suppliers out there. Good luck and happy star hopping