How does Amazon sell a 300.00 cartridge for 180.00?

I should get a few laughs from this...I bought a Nagaoka MP110 cartridge from Amazon. How the hell do you get the cartridge out of the plastic case it’s in? Pry it open with a screw driver? I feel taking a sledge hammer and cracking open but that’s probably not a good idea. Help!

A few years ago in this Century I purchased a 103 from Comet Supply for $88.00 plus shipping.   Comet Supply sells Industrial Cleaning and Office stuff.  They also sold a lot of Denon gear and I have no clue why.   The prices were hard to believe but they came thru.   I bought two 103's and a 103r.     

I saw a thread with a link to Comet Supply and thought it was a mistake...Do you know if they still have them?

Comet hasn't been seeking Denon carts for some time. I got a bad one from them and had a heck  of a time getting it replaced.