Looking for the following:

1st Mattress
Budget: 2-5K
Size: King
Firmness/Material: Older folks who need firm mattress, their current place uses pure coconut fibre which was 1.2k for super single FibreLux. Wondering if there are better brands for them.

2nd Mattress
Budget: 2-5K (or above if necessary)
Size: King
Firmness/Material: Prefer firm but maybe slightly less hard, possibly coconut fibre + latex, but don't want it to sink down after prolonged use.

Would be grateful if can get advice or where to look. I looked at FibreStar, the lower range are very cheap (<2K) but they won't let us test the mattresses and we are not sure of the quality of the firmness and product. When we went to Starling to check out Fibrestar it's all premium that goes from 6K-10K way above budget and the salesman was a bit lansi to us

Not knowing there's such informative thread here, i posted in another thread asking for advice on buying a new mattress as we're moving to a new house. Did a bit of research after some of the seniors here posted napure brand, but it's way too expensive for me...

Due to our financial constraints, are there any cheaper alternatives, like within the range of RM1.5k?
As we need to spurge more on other costly necessities first, we can only afford to have a lower - mid range priced mattress.

Would appreciate any advice given.