Either contact:
Derbyshire Ancestral Research Group (DARG). Please contact them for further information*. A copy of their St Giles Church, Matlock transcriptions may be viewed at their Birchwood Chapel Headquarters, at County Hall Local Studies Library and at the Society of Genealogists. You will need written permission from the DARG to photocopy from the books held at both County Hall LSL and SoG.
Further information is on their respective web sites.
Contacting Derbyshire Ancestral Research Group
Contacting County Hall Local Studies Library
Society of Genealogists info

*If you are seeking an MI published by the Derbyshire Ancestral Research Group (i.e. an MI in St. Giles' Churchyard) please contact the webmistress before you write to them as I should be able to provide the reference.

Or:
Derbyshire Family History Society (DFHS). They have published a microfiche of the transcripts for Holy Trinity Church, Matlock Bath, which is for sale from their Book Sales Manager (see web site for address and full list of their publications).
Note: Price only in £ sterling (GBP).
MI's - 35. Matlock Bath Holy Trinity £1.00 to UK; £1.20 O/seas Airmail
The original transcripts are held by the church. Those wishing to enquire about burial details relating to MIs are recommended to contact the Derbyshire Record Office in the first instance. A few Matlock Bath Holy Trinity surnames have an asterisk * beside them to indicate that names have been listed by the church, but do not appear on the mfc..
Derbyshire Family History Society (DFHS) website
Contacting Derbyshire Record Office