Managing SSL certs and vendors

As I keep adding more and more SSLs the renewal of them is becoming a pain as
the process for renewing and ordering is very manual and our preferred SSL
will only accept payment each time using credit card.

It would be nice if I had an account setup with an SSL reseller where I
could order and renew SSLs using POs with some extranet/portal with this
vendor showing all issued certs from one place and their expiry dates. The
way our business works means that I can only order them for 12 months and I
have about 20 that expire all on different dates.

Anyone know of a SSL reseller who does this and makes the process more
manageable.