Hi I'm new to this forum

IDK if this is the exact place i should be posting this, but...
When I first saw this project I was impressed, and decided to case all my N64 games

I bought 30 cases from The Video Store Shopper Website.
I placed my order and I recieved an email confirmation and everything!
Today I just recieved another email from a manager(?) claiming they cannot sell me 30 cases only sleeves of 100.
I was just wondering, do you have to buy sleeves of 100? Was that a real email? From people who have bought cases from that place...
I replied with an angry email