The problem with sight-reading isn't that it's difficult. It's that it can't really be done too early on. You need to be further than Alfred Book 1, in my opinion, to actually start sight-reading. Until then, you should invest in some sight-reading books to practice the techniques required to sight-read (further described in other posts, search for them).
Some I recommend are:
-A Line A Day
- Four Star
- Improve Your Sight-Reading! Piano
- Complete Series
- Any 'Notespeller' or 'Sightreading' book that goes alongside a children's method series.
- Another Adult/Childrens Piano Method: Piano Adventures, Bastien, etc
You're right. You need to purchase things. But at this level, you're not advanced enough to sight-read anything that is really available online, except for maybe a few things here and there.
But, at this level, you SHOULD be practicing as many pieces as you can. It's waaaaay more beneficial to your sight-reading than actually attempting to sight-read poorly. If all you ever do is sight-read poorly, that's as good as you're going to be at it. But if you work hard at this earlier level and practice a ton of material (and at later levels too, of course), sight-reading will become a cinch.
Also, do lots and lots of theory. I kid you not, nothing could help your reading more than that.Find a few things on IMSLP.
Practical Exercises for Beginners, Op.599 (Czerny, Carl)
110 Progressive Excercises, Op.453 (Czerny, Carl)
100 Progressive Recreations (Czerny, Carl)
100 Progressive Studies, Op.139 (Czerny, Carl)
Vorschule im Klavierspiel, Op.101 (Beyer, Ferdinand)
Kleine Handstücke für angehende Klavierspieler (Türk, Daniel Gottlob)
Diabelli Melodies, Primo parts:
The G Major website provided above does give a lot of music scores to practice with. Others are:http://www.easysheetmusic.com/
(3 a day unless you subscribe)http://www.pianostreet.com/
(some free downloads are made accessible, I think)http://jeanies_home_studio.tripod.com/id14.html
(You have to look through it, but there's quite a few pieces here)http://www.music-for-music-teachers.com/beginner-piano-music.htmlhttp://www.8notes.com/piano/http://www.sheetzbox.com/
And there's plenty more than that...
But again, I think it's more beneficial to actually learn the material, instead of constantly sight-reading, at this level - save for those sight-reading books or some very, very simple music.