Encore Mystery, MoviePlex, and Starz Cinema were recently added to
HD Platinum ($10/month) [Note: Pixl and MoviePlex are not on this page as they were the last channels to get added to the add-on although their logos are on the main HD Packages page.]. I am not sure about HD Absolute since it is a grandfathered package from what I understand; I suppose other HD Absolute subs would know.
However, there are other ways to get these channels.
Starz Cinema is also in the Starz
premium package, but that is probably a given. Encore East (HD), Starz East (HD), Starz West (HD), Starz Edge (HD), Starz Comedy (HD), Starz InBlack, and Starz Kids & Family (HD) are the other channels in the premium package. Starz is $13/month or less if combined with another premium package; please see the premium package page for bundle savings if wanted.
Encore Mystery and MoviePlex also included in
America's Top 250 (currently $64.99/mo.) or/and Encore Movie Pack (currently $5/mo. add-on) if you do not sub to America's Top 250. You probably would not want to go from HD Absolute to America's Top 250 since you would most likely lose grandfathering of the HD Absolute package; I am not even sure if you can add anything to it. Maybe someone else can help.
[In addition to
Encore Mystery and
MoviePlex, the Encore Movie Pack includes Encore (West), Encore Action, Encore Drama, Encore Love, and Encore Westerns. Note that Encore East HD and Encore WAM are not included in the Encore Movie Pack. Encore East HD is available in America's Top 250 and Starz while Encore WAM is available in America's Top 250. I do not get why, but that is how it is. It would be nice if they were all included in, but like I said, it is what it is. It would also be neat if they added the standard feeds of IndiePlex and RetroPlex to the Encore Movie Pack. Dish certainly has some options available; that is what I like about them even if they may seem confusing at first.]
Also, I believe there is an HD feed for Starz Cinema. Therefore, it may be added "soon." That is not official; I am just saying that I believe there is an available HD feed. I do not know anything about HD feeds of Encore Mystery or/and MoviePlex, though.