I 3-star'd everything on the first day and mincost 4/5'd Balinda with 6 copies so I've mostly just been farming 50/5 for soldiers and plat armors with natural regen.

I didn't have much luck with Balinda at 40/3, getting nothing after 4 runs, so I switched to 70/6 which netted me 5 copies in 6 runs.