i got 2 words for you.. Over Priced.
that is waaay to much for 100 magnets and 4 drill bits.
www.amazingmagnets.com is my go-to magnet source, with sooo many shapes and sizes at such low prices (with quantity discounts too) you can find what you need easily.
there is no need for HSS bits as you are only drilling into plastic and your "helper tool" could be the back of a nail or a hex bolt.
you should be able to get away with using crazy glue for smaller magnets, 2 part epoxies use too much material when mixing a batch up. If you really need some that you can atleast attempt to measure out i would go with J-B Weld as it comes in squeezable tubes.