iirc, there are vendors that sell NQ items for a few thousand gil, no need to spend 300k on a NQ item for tank leveling.
If you want gear that's a bit better than NQ, there's always the GC seals green items that can be good, depending on your level. I used the GC seal ones when ARR came out, since I didn't have any gil to rub together. The seals were easier to get, due to old gear from dungeons.