Traditions has their Crocket rifle in .32 and Shenandoa in .36 with half and full stock.
www.traditionsfirearms.com

For a little nicer quality and finish in myview, Pedersoli has .32 and .36 caliber available in the Frontier with I think .32 in Kentucky, Pennsyulvania and I think a couple of others. In either Flintlock or Percussion.
www.davide-pedersoli.com
www.dixiegun.com(Distributor)
www.cabelas.com (Distributor) BLue Ridge is cabela's version the DP Frontier.
http://www.davide-pedersoli.com/default.aspx?item=distributori&lang=en

For nicer yet but still under $1K (or much more $ if you want custom), check out Track of the Wolf. They currenty have a .36, .37 and .38 calibers in percussionfor less than a grand. Also have kit's as well.
www.trackofthewolf.com

Tahquamenon