I have a few treatments left, maybe 4.
Last time I checked my insurance totals, it was over $100,000 USD. However, this includes surgery (about $5,000) and radiation (maybe about $20,000). That leaves about $75,000. Of that, probably $40,000-$50,000 will be for Herceptin. This is not "technically" a chemotherapy, but rather an antibody treatment for one type of breast cancer. This leaves roughly $25,000-$35,000 for chemotherapy (dose dense AC + Taxol) + Neulasta for boosting white cell counts. The Neulasta I was told was about $4000 per shot. So the chemo itself is down to about $9,000-$19,000 ... let's cut that down the middle and call it $15,000. I believe that is so "cheap" because the drugs (Adriamycin, Cytoxan, and Taxol) are mostly older chemo drugs and their patents are likely expired by now (except maybe the Taxol).
Though my treatment will only last slightly over a year, the timing is such that I will hit deductibles/copays in 3 calendar years, so my out of pocket for the whole adventure will be about $5000. Even with insurance, someone less fortunate than myself or on a fixed income might have quite a struggle hitting that amount.