if u able to keep track of all the projects there whats their early bird price, subsequent increased price and etc to compare with the price u going to see in the fair... otherwise how do you know its giving discount or high rebates... it could be they mark up the SPA price against and give high rebates... and u happily thought u get a good deal...

only if your project already successfully applied to be part of HOC before you sign your SPA.... otherwise its up to the mercy of the developer whether wanna include u into the HOC application or not....