It may not be so easy to discover this on your own. This is a good opportunity to get the whole package for 1.98 like I just I did. To clarify, Peggle Nights is an IAP (in-app-purchase) from Peggle. Peggle is usually 1.99 or 2.99 and Peggle Nights is usually 2.99
ya, I dont mind heads up on IAP sales like this one. Its hard to keep track of considering appshopper doesnt track such sales yet (will be a cool feature to add though).