assaulted with battery

[SCHMIDT@LNS62.LNS.CORNELL.EDU]

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Audiphiles!

Recently there was some mention of under-the-seat batteries for the
5000/100 series Audis;  I skimmed over the postings and then deleted
them. Well, mea culpa, this morning when I turned my ignition key, all
I got was a "chattering" from the starter.  Methinks that my battery
('89 100Q) is retiring after 5 years of service.  I managed to jump-start
the vehicle (there's SOME advantage to having a house on a hill!),  but
am concerned about impending COLD weather.  Can anyone point me to a
non-Audi (non-dealer) OEM-style battery with the built-in vent?  Or
will I have to bite the bullet and get the obscenely-priced battery
from the dealer?

Any and all input invited, and thanks!

jos