Neither the account-wide version nor the single character version show up here:

Travel & Housing → Mounts → Store Exclusives

The banner at the top didn't work at all at first. Now it links to the advertised uber-bundles.

The single cosmetics I can only find via search or under the New menu (or was it Limited).

Anyhow, I can't find the Reveller's Gilded Horse Single Character via any means, i.e. anywhere either via menu navigation or various search keywords.

It (Reveller's Gilded Horse Single Character) is advertised here:

http://www.lotro.com/lotrostorelimitedrelease

"Available for purchase for a single character for 1,995 Turbine Points, or for every character on your account for 2,995 Turbine Points!"

But it is not in the store.

Of course it is very odd that it shows up in the prose of the advertisement but not in the final Turbine-coin itemized summary.