Amazon has the well-reviewed 89-piece Wheeler Professional Gunsmithing Screwdriver Set w/ Storage Case (‎WH562-194) on sale for $46 with free shipping. The 43-pc set is also on sale for $22. 

Includes: (54) hollow-ground flat bits, (15) specialty bits, (8) Allen, (4) Phillips, (3) Torx, (1) 2 ¼ shaft extension and (1) hex-to-square drive adapter.