The following digitial distribution sites have Eric Herman MP3s available for download, both as individual songs and full albums.
Monkey Business is still being added to many of these sites.

Prices are typically $0.99 per song and $9.99 per album.

There is not always a "children's music" category at these sites,
or 'Eric Herman' will not always be found when browsing artists,
but a search for 'Eric Herman' or a song title should work.
Apple iTunes
BuyMusic
Rhapsody
MusicMatch
NetMusic
DiscLogic
Napster
AudioLunchbox
MP3tunes
Etherstream
Music4Cents
RuleRadio
EMEPE3
CatchMusic
QTRnote
Puretracks
Viztas
MSN Music
Emusic
LoudEye
MusicNet
Weed
Mperia
OnlinePromo
DigiPie
WeedFiles (WeedICP)
MusicNow
Share NewYork (WeedICP)
iSound
PlayIndies
MyKid'sTunes
Sony Connect
Bitmunk
Ruckus