So this guy at a music shop at the music shop is gonna sell me a VS100 and a halfstack for about $650

Is this a fair deal? I dont think it is, I think that fool is ripping me off, but I really lack gear knowledge. Im thinking about just trying to lowball the 4x12 and buying a different head, maybe the internet or somthing. What do you guys think?
Your plan sounds solid. The head is crap. What speaker cabinet is it?
Gilchrist custom
Yamaha SBG500
Randall RM100 & RM20
Marshall JTM45 clone
Marshall JCM900 4102 (modded)
Marshall 18W clone
Fender 5F1 Champ clone
Atomic Amplifire
Marshall 1960A
Boss GT-100

Cathbard Amplification
My band