Bob, try your local hardware store.
Fusewire is just the stuff you put in normal household fuse boxes, you the know the big ones that control the power coming into your house.
Fusewire usually comes on a card with various ampages, normally 5, 15, & 30Amps, the higher the ampage, the thicker the wire.
I use it for wiring and hydraulic lines, and it's way cheaper than buying specialist modelling wire.
Hope this helps.
Karl