I made the following shark invitation (personal details purposely blacked out) on my computer. I used Avery postcard paper to print them and some foam stickers I found a Joann's to add the shark.
I wasn't sure what to make for party favors, but these turned out great. I bought everything except the stickers & bags at the dollar store. The stickers were what was left over from the invitation shark sticker package. I used Avery 2x4 labels for the bags. The bags were 97 cents at Wal-mart for 20 bags.