I think Speaker Craft makes an enclosed in-ceiling line of speakers in the $300 range (each I think).
Def Tech also make a large enclosed in-ceiling, but I think it is designed for surround sound, not as a main. It does does not look like the traditional in-ceiling is enclosed.
B&W may also make an enclosed in-ceiling as well if I recall correctly (most likely in the $700 range - each)
I had the same issue when trying to set-up my challenging room and placement of a center speaker. Since I could not get timber matched enclosed in-ceiling speakers, I added a back-box called Dynabox (from Dynamat I think - off Amazon). They run around $150 ea. I am very satisfied with this solution and have received several compliments on the sound quality and clarity of voice. My set-up consists of Atlantic Technology in-walls plus dual center in-ceiling speakers with the dynaboxes as enclosures.
I also liked the in-ceiling for it's directional capabilities - the woofer was angled, but the tweeter was directional allowing me to point the tweeter right at the listening position. Most angled in-ceiling speakers are limited to a set 15 degrees, which equates to approx. 2 - 3 linear feet from the speaker to the listening position off an 8' ceiling.