G'day Rocky
Ask around electrical suppliers & automotive accessory shops, like autobarn or auto one, someone there should be able to give you ideas, who still sells them.
I presume you are asking about the glass fuses.
I have bought them from Bursons not long ago, & also found a few packs of 3AG & 2AG fuses in a clearance bin at Ashdown Ingram.
I'm sure auto electricians & mechanics would still use them, maybe ask where they get their supplies