When do u guys start buying stroller, baby cot, and whatever is needed?

I listed out all the baby necessities and purchase them over time slowly starting from second trimester, when the baby gender has revealed. If I can get good deal from online shopping I will do so but do not need to travel around, e.g. iherbs. I will take note of any sales e.g. diapers at ntuc, kiddy palace yearly 20%, spring maternity and etc. Personally I do not like to go to baby fair as it is very crowded and long queue. For large baby items e.g. cot and stroller, I will at least visit showroom to decide which one is suitable for me and baby.