The tools you need for miniature and pen turning are identical to full-size tools only smaller. This set contains more than the absolute minimum you need but
Carving tools I use for oak furniture
Henry Taylor Miniature 5 Piece Turning Tool Set – Toolnut
Miniature Skew Chisels by Ashley Iles
Boxed Set of 6 Ashley Iles Miniature Turning Chisels, Made in England
Gifts For Turners
Ashley Iles Peter Benson Carving Tool Set 1
Crown Micro Turning Tool Set - Fixed Blades - 5 Piece – Toolnut
Henry Taylor Miniature 5 Piece Turning Tool Set – Toolnut
Sets of Miniature Turning Tools by Ashley Iles
I Read a Review - Paul Sellers' Blog
The Eli Avisera range of turning tools - Ashley Iles (Edge Tools) Ltd
Straight V-Tool (Sweep 39) [SWEEP 39] : Ashley Iles Tool Store
Ashley Iles - MkII Bevel Edged Chisel 31mm
Ashley Iles Beginner Carving Tool Set - York – Toolnut