What are Mini Lp's

What exactly are mini Lp's and why do they sell at outrageous prices? Are these special pressings? How do the sonics compare with regular Lp's?
good question,id also like to know!
Mini LP

Have a good day
I disagree with the information provided by your link, Brad. I have been buying Japanese CD's, due to their generally superior fidelity. A mini-LP is a Jap. CD that is packaged similar to the older "gatefold" vinyl LP's; that is the cardboard jacket folds open. These CD's have a rice-paper like sleeve that protects the CD, again, like the vinyl LP. Other Jap. pressed CD's are packaged like a conventional CD, with a jewel case packaging.

Your link's website describes what I've always known, and always heard referred to as a vinyl EP [extended play], either pressed on 10" or 12", containing 3 to 6 songs, and played at 33-1/3 RPM.