cPanel Admin Cloud (up to 5 accounts): $15/month
cPanel Pro Cloud (up to 30 accounts): $24/month
cPanel Plus Cloud (up to 50 accounts): $32/month
cPanel Premier Cloud (up to 100 accounts): $40/month
Accounts over 100: $5/month per 25 accounts
To order, click here.
cPanel installation instructions are available on cPanel's website; instructions for disk quotas on OpenVZ are here.