Looking for a 6.4 Hemi

Modern Muscle said
We have 12 New Crate 392s In stock right now.

http://www.modernmuscleperformance.com/product/392-64l-hemi-crate-motor

Sure at $7650 + 800 core charge, + 400 shipping = $8850

I can buy it from Monicatti Dodge for $6500 + shipping

Why is there a core charge on a brand new engine ?