Sorry I have not responded sooner. But here are the two albums I picked up.
Songs for a Williamsburg Christmas- This was originally produced in 1982 by the Colonial Williamsburg Foundation. It features the Williamsburg Madrigal Singers. They were 5 singers who worked at Williamsburg. The song list includes a lot of old standards such as Deck the Halls, Holly and the Ivy, Joy to the World, and Coventry Carol. However, it does have several songs which were much better known in the 1700s than they are today, such as: O Jesu Sweet, If Angels Sung, A Virgin Most Pure, and Lute-book Lullaby.
The other cd I picked up was
A Colonial Folk Christmas- This is by Linda Russell and Companie
This cd, at first listen is very good in terms of historical sound. The instrumentation fits the colonial period and the singing is solid, however, perhaps not quite as time period as the music. This one also has a good mix of well known songs as well as lesser known tunes.
The Holly and the Ivy, I Saw Three Ships, Silent Night, Angels We Have Heard on High are all known standards. However, the cd includes; The Friendly Beasts, Staten Island Hornpipe, Winter Apples, The Seven Blessings of Mary.
I purchased both from Amazon, so hopefully you can find them there. I am planning ahead for the Santa Tracking as I plan on doing a few hours worth of music. I want to feature an hour, or maybe two, with historical versions of Christmas songs. I also want to do some research and be able to provide some information about the songs.
In other Christmas music news... I also purchased an album which came out this past Christmas. A Ghostly Gathering by Midnight Syndicate. It is....different.

If do like it, quite a bit actually, but be prepared for something different. Midnight Syndicate is known for Halloween Music. They have several Halloween CDs out. Mostly original music with sound effects thrown in. Their Halloween stuff is really good. Well, they decided to take a crack at Christmas Music. They kept their sound, and by the title you can see they kept the Halloween in their too. The CD is a combination of original material as their versions of a few standard Christmas songs. If you get the chance and are looking for something to change up your "normal" selection of Christmas music, I highly recommend the CD.