One of my favorite plastic Easter things is our set of Resurrection Eggs. If you don't yet own a set of Resurrection Eggs it's probably too late to order them on-line but you *might* be able to find them at your local Christian bookstore, Family Christian Stores®, or at Wal-Mart®.
A great resource for hosting an evangelistic egg hunt is the Resurrection Eggs Activity Booklet. It's 8MB and 61 pages so make sure to skim before deciding to print the entire document. You can also print selected pages.