Now that I like, the axles on my cam jack knurler are always wearing down too fast.In fact some of them become knurling tool axles...
Robert
You might want to check eBay. There are currently over 195,000 listings for various drill bits. Over the years I've purchased literally hundreds of drill bits on eBay at more than reasonable prices. If you find the sizes you're looking for there are usually a dozen different brands and styles available. I always buy only well known and respected brands, and found it's far less expensive to find a vendor selling drills by the pack than buying individuals.
I generally check with vendors who specialize in surplus tooling. They often times buy new old stock (NOS), excess inventory, and from businesses closing their doors for one reason or another. In the last 2 years I've bought over 150 drill bits on eBay. They're all name brands like Nachi, Greenfield, Precision, Morse, and Triumph. In all cases I check the prices for the same units at industrial suppliers before making a purchase. In every case the price on eBay has been from 50% to 80% less than the industrial suppliers. In some cases I could purchase a pack of 10 or 12 for less than the industrial vendors were asking for a single unit.
I know you are after individuals, but a lot of us have had pretty good luck with the Harbor Freight cobalt set of 115 bits for about $100. Watch for a sale and use a 20% off coupon. I own one set of HF TIN-coated "HSS" bits (115 pc. set) that were picked up new for around $40 years ago. Everything else I have is US made HSS. The HF cobalt ones have worked just as well. The HF TIN ones are unused on a shelf. You may consider retiring your cheap set too.
Bruce