"The list price is $150 each for Turbo Pascal, Turbo C, and for a bundle containing both Turbo Assembler and Turbo Debugger."

p8 October 1988 https://books.google.com/books?id=WSBVAAAAMAAJ&pg=RA18-PA8

Smalltalk/V 286 included source-code debugger, bit mapped WIMP for MS-DOS, BitBlt graphics, … Turbo Pascal + debugger already cost more.