Express pass is a deluxe resort perk. Early entry is an onsite resort perk. You do not have to book a package to get them. ANY way you book a deluxe resort you will get both. ANY way you book cabana bay you will get early entrance.
You want to look at packages but you also want to check out booking room only (either through universal or Loews directly or Travelocity or wherever you choose) and buying tickets from your choice of vendors. (We often talk about maple leaf tickets as well as undercovertourist here)
See the costs, the cancellation and change policies, and what you get. Just remember that those perks you mentioned aren't package-specific perks.