I'm looking for multiport agregators/switches and single media converters (single-mode, single or twin fibre, P2P).
Locally available so far I have only seen Moxa and Allied Telesys.
theEd: Our LevelOne brand has surprisingly decent (and cheap) fibre gear. If you're a reseller message me and I'll hook you up with pricing, otherwise Ascent/Acquire sell everything we have.
Aside from that, pretty much anyone who does switches does fibre now - it's not a specialist item anymore.
Evilg: With quantities like that I would hit up an electrical wholesaler like Ideal Electrical or JA Russells. The other option is someone smaller like Lan Cabling Specialists in Penrose in Auckland.
Let me know if you need any more advice here.