I believe that HostingV2 can provide the service at the most economical prices. We can offer the following which I believe is more than enough for your client's needs.
500MB Disk Space
Host Unlimited Domains
Unlimited Emails/SQL/FTP etc.
Dedicated IP Address = $36/year
Dedicated IP Address + PositiveSSL = $40/year
I'm willing to offer our Peasant plan along with dedicated IP address and PositiveSSL certificate for a grand total of $42/year, which is a $6 savings from our usual price.
if you would like to proceed.