Wine appraisal

[Ruccid]

Hello out there,
I have some old wines and I would like to kno0w their value. Can anyone out there give me an idea as to how I can find this out or just give me a ballpark figure?
These are the wines
(2) Grgich 1982 cabernet sauv. Napa Valley
1985 Ravenswood Cab Sauv. Sonoma
1985 Jordan Estate Cab Sauv Alexander Valley
1985 Briarcrest Cab Sauv Alexander Valley
1984 Grgich Zinfindel
1986 Siverado merlot
(2) 1982 Dom Pierinon (sp) Champagne
1986 Grahams Alvedos vintage port
1985 Warre's vintage port

Thank you for your help!
Dave Rucci