Buying Zaber and S4 mini

Hello SFF forum,

I am new to the SFF genre, currently looking into two chassis, Dr zaber sentry, NFC s4 mini.

The sentry could be any color,
S4 needs to be full black or full silver.

If the chassis was modded, please still feel free to contact.
I am more than happy to buy both with reasonable price matching its rarity and design.