What to buy on Google Play?

So I have been getting these points on Google Play and they tend to expire around this time of the year. I usually buy music related apps (e.g. guitar pro, fakebook pro, smartchord) but I think I have all app I want on my phone. There are about $45 to blow and I am also considering an ukulele related e-book. So if you have anything to recommend from Google Play I am open to suggestions. Unfortunately these points are not transferable .

How about a ukulele fake book? Google play has several.

You can sample the books, which will give you an idea if the content is to your liking.

Of the few ukulele-related books I have bought on Google Play, I think my favourite is The Grammy Awards 1958-2011 Ukulele Songbook published by Hal Leonard. They are all great songs, but seeing as they span such a wide timeframe it's an eclectic mix.

Thanks for all the suggestions. For now I got this book on jazz to get me started, but my account has not bee updated for another year ... we will see:

https://play.google.com/store/books/details/Abe_Lagrimas_Jr_Jazz_Ukulele?id=ArqtCwAAQBAJ