From my experience in last year, the price in the Expo is not the cheapest. However, you might find some special items that it is usually display in the shop there.
Please take more cash with you since credit card might be used in some counters only and for sales over $500.
Indeed, I might not attend the Expo if I were you since it do really crowd.
I recommended you to buy a magaine called '孕媽媽' before since there will be some introduction for the Exbo and coupons might be attached.
Hope you find the above sharing useful.