I bought Matsuco from Kiddy Palace, they have two sizes, i bought the bigger size one $159 at as it seems more stable. There is only one kind of mattress for the big size one at $55. Mattress cover is around $18.
There are some shops that are having promo, playpen comes with free mattress. Can go shop around. The last time i saw a promo for playpen was at Tom & Stephanie.