新加坡采购需求：和纸胶带、计划贴纸、牛皮便签、日记卡、翻领别针、金属书签

I'm looking to place an order for 600 pieces of post-it/memo pads, evenly split across 6 different designs (100 pcs per design). I'd love to have these printed in full color. In terms of size, please recommend the most cost-effective option you can offer that still maintains a good quality print. Additionally, if you could let me know the available options for materials and any bulk pricing discounts, that would be great. I'm aiming for a quick turnaround time, so any details on production timelines would also be appreciated. Looking forward to your prompt response!