Who does Amazon use to fulfill their Magazine Subscription orders? I
am in search of a fulfillment company that can offer subscriptions for
a large number of magazines (Amazon lists 80,000). I would like to
sell these magazines on my site and have a fulfillment company do the
rest.

Hello farside847 and thank you for your question.

Amazon actually uses two companies to fulfill their magazine
subscription orders.  They are:

"Synapse Services, Inc
Synapse Group, Inc.
Four/Five High Ridge Park
Stamford, CT 06905

Main Number: (203) 595-8255

E-mail webmaster@synapsemail.com"
http://www.synapsegroupinc.com/contactus.html

And:

Magazine Express
5724 Highway 280 E
Birmingham, AL 35242
205-408-4947 
http://www.magazineexpress.com/

http://arc-sos.state.al.us/CGI/SOSCRP10.mbr/output?PGM=1&P01=224076M
http://www.iplease-alabama.com/write.asp?state=AL&category=596303

Also see:

Magazine Express
Tim Farrell
Phone: (201) 816-0700
E-mail: timf@magazineexpress.com

Parent company of Magazine Express, Inc.
"EBSCO Information Services
P.O. Box 1943
Birmingham, AL USA 35201-1943
Phone: (205) 991-6600
Fax: (205) 995-1518 
EBSCO Publishing
10 Estes St.
P.O. Box 682
Ipswich, MA 01938-0682
Phone: (978) 356-6500/(800) 653-2726
Fax: (978) 356-6565 

EBSCO Book Services
Phone: (800) 815-9627"
http://www.ebsco.com/home/contact/default.asp

See:

Amazon
"Our Magazine Subscription Providers

Synapse Services, Inc., and Magazine Express, Inc., are the sellers of
record for magazines on Amazon.com. Here are a few things to note
about them:

When you are billed for your magazine subscription, you will see both
Amazon.com and the name of the subscription provider on your credit
card statement.
We will share your name, order, billing address, and shipping
information with the appropriate subscription provider.
Magazine customer service is handled by either Synapse Services, Inc.,
or Magazine Express, Inc.

If you are a magazine publisher and would like to offer subscriptions
on our site, please visit our Publisher Services page.

Synapse Services, Inc.

Synapse, located in Stamford, Connecticut, is a leader in the magazine
subscription business. Our relationship with Synapse allows us to
bring you the selection, prices, and expertise that you've come to
expect from Amazon.com.

Magazine Express, Inc.

Magazine Express, Inc., a division of EBSCO Industries, Inc., draws on
more than 50 years of experience in subscription services and is
headquartered in Birmingham, Alabama.

EBSCO is the largest subscription service agent in the world, with 31
full-service offices located in 19 countries."
http://www.amazon.com/exec/obidos/tg/browse/-/602292/103-0610161-3600639

Thank you for your question, and if you need any clarification of my
answer, do not hesitate to ask before rating my answer.

Very best regards.

THX1138

Search strategy included:
amazon "Magazine Subscription"
://www.google.com/search?as_q=amazon&num=10&hl=en&btnG=Google+Search&as_epq=Magazine+Subscription+&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_occt=any&as_dt=i&as_sitesearch=&safe=off

Thank you.