Anyone use before? As in how accurate are those quote? I quoted a plaster ceiling of 10*10ft it says under 2k
Is that the market rate?

It is better for you to follow some FB groups where you could get your contacts. I just did my gypsum board ceiling. The price varied depending on the ceiling heights. Below 3m ceiling heights, the unit price ranged from RM 3.x- RM 4.x psf, depending the type of board used. But, for areas smaller than 200-300 sqft, the supplier shall charge you a lumpsum to cover their transport and labour cost. You see, if the job need two person to travel to your place, they need to recover their overhead. For 10 x 10 ft, you have to ask the supplier. I don't think they will offer RM 3.x- RM 4.x psf. But, if it is more than 1k, i guess you get more quotes. Go to FB and search for plaster ceiling, you will see a lot of pages.