Ciao
I'm not going into the price, but the vSAN licensing guide that you find here:
VMware vSAN White Paper
there are these types of licenses:
VMware HCI Kit bundles
New licensing and packaging options were introduced with vSAN. VMware HCI
Kit ™ bundles simplify the purchase of vSphere and vSAN licenses. There are five
data center kits with per-CPU licensing and two ROBO kits with per-VM licensing:
• VMware HCI Kit Essentials (for 6 CPUs) includes vSphere Essentials plus
and vSAN Standard.
• VMware HCI Kit Standard (per CPU) includes vSphere Standard
and vSAN Standard.
• VMware HCI Kit Advanced (per CPU) includes vSphere Enterprise Plus
and vSAN Advanced.
• VMware HCI Kit Enterprise (per CPU) includes vSphere Enterprise Plus
and vSAN Enterprise
Probably for your needs the:
VMware HCI Kit Essentials (for 6 CPUs) includes vSphere Essentials plus
read the document and check