Periodically, post the1879 war the authorities, ie the NMP, at the behest of the Natal Colonial Government were tasked with disarming the Zulu nation. They were also seeking out the lost MH's from Isandlwana along with 500k rounds of .577/ ,450 ammunition too. So, on these disarming campaigns literally thousand of assegais from Zululand were brought in and destroyed. If they were oversize, confiscation also included the Zulu iwisa's ie knobbed sticks. During the course of all of this some of the captured MH's and ammunition was recovered too.
Thus, it is unlikely that many Zulu weapons actually used in the AZW will have survived and been freely available.
However, the curio trade picked up on the interest by tourists for 'genuine' AZW assegais and they, being very entrepreneural went into production, swearing by everything holy, that their weapons were the real Maccoy.
One such enterprise can be found today in Zululand in the Dukuduku forest at St Lucia. (near Mtubatuba). Here, an elderly kehla, one Mkize, who still smelts the metal in his home built forge and carves the hafts from hardwood harvested from the surrounding forrest, using traditional methods. He sells his product, the completed assegai, or mKonto in the curio stalls in Mackenzie street, St Lucia. This interesting old fellow will also tell a war story or two while squatting at his forge and taking his daily snuff.