We have the 1-60 sets here for $24.95. The 61-80 sets are at most hobby stores for about $10-15.
This is for imported bits, but they are adequate for the job.
The good USA made stuff is quite a bit more expensive, about $45-60 for the 1-60 set, and $20-25 for the 61-80 set. I stocked them for a while, but had few orders due to the low cost of the imported stuff.
We have 5 sets of the 1-60 bits left, then we will not stock them anymore.......Cliff