Ya, these special litter box are really expensive, but when I calculate the savings on the litter itself, it ended up quite well worth it. I bought the box at S$66, S$17.80 for litter. Well, high start up of S$83.80, but if I divide by 7mths, it only cost me S$11.97pm. Thereafter, it will cost me S$2.54pm cos I don't need to buy the box again.
I have read somewhere online that someone actually did DIY the sifter box, I suppose if you are good at it, why not, lol. Anyway, PeeWee also have the hooded ones in Sg, there are 3 different models Cat Litter Box - PeeWee PET ACCESSORIES Cat Litter, Litter Box, Scoop
I picked the one with high sides.