We're not sure we've seen cleaner Boss pedals here in the shop than this Boss CE-3 Chorus (along with some other Boss pedals from the same collection). 

Following the success of the CE-1 and CE-2 chorus pedals, the CE-3 represents Boss's classic effect in a simple yet effective format, creating the lush, swirly chorus tones that made it perhaps the most famous modulation sound in decades.

This is a Near Mint example that comes in its original box. It works perfectly and sounds fabulous!