These folks at
http://www.rapidonline.com/Electrical-Power/Fuses-Circuit-Breakers/32mm-Fuses/Antisurge-32-x-6.3mm-ceramic-fuses/64647
have ceramic, sand-filled fuses in "small" and "large" sizes with a wide array of amp values. I think they are 50 cents or so US$$$. They don't use silver though - if that makes any difference. On the Hi-Fi tuning site it seems that the sand issue was raised and proved difficult to manufacturer for some reason.
http://www.rapidonline.com/Electrical-Power/Fuses-Circuit-Breakers/32mm-Fuses/Antisurge-32-x-6.3mm-ceramic-fuses/64647
have ceramic, sand-filled fuses in "small" and "large" sizes with a wide array of amp values. I think they are 50 cents or so US$$$. They don't use silver though - if that makes any difference. On the Hi-Fi tuning site it seems that the sand issue was raised and proved difficult to manufacturer for some reason.