Jolly Songs probably cheaper on Amazon!
DD loves it. she's been singing /a/ /a/ ants on my arm... etc
the main thing is to remember to really focus on the letter sound and not add the 'uh'
so /s/ is ssssss NOT 'suh'
/m/ is mmmmm NOT 'muh' etc
some supposedly help-your-child-with-phonics resources don't do it right (like Maisy alphabet DVD - not happy about that!)