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I saw Taka (bb dept) selling the mattress. Very firm. at $159, if I'm not wrong. less than $200. Kidz Mall at Suntec also sells mattress, but not as good quality as the Taka one I find, but much cheaper. maybe can consider buying 2 of the cheap mattress from Kidz Mall. Will you be getting a cot? If so, can consider the Babycraft ($299) which I saw at Taka, Isetan and CK Tangs. The height is very good as compared to other cots coz no need to bend so low and it comes with high density foam mattress, bedding set and musical box.
BTW, Robinsons also sells the Medela dual pump.