Can you get a fuse to repair a Keurig single serve coffee maker that burned out the fuse?

In general, fuses are available from electrical and electronic parts suppliers, so the answer is probably yes. There are a number of different kinds of fuse, and specific details will have to be provided to the supplier to let them know exactly what it is that you want. Also, these suppliers don't stock fueses for specific makes or types of equipment, but rather for a give voltage and current rating. They will also have to know what specific fuse type (like glass or ceramic, fast- or slow-blow, etc.) that you need.