There's an early 15th Century (1400-1450) poem called London Lickpenny which has a description of contemporary sellers' cries, as well as an interesting (satirical) description of parts of London etc. Here's a few quotes:

"Hot pescods!" one gan cry,
"Strabery rype, and chery in the ryse!"

and

Then come there one, and cried "Hot shepes fete!"
"Risshes faire and grene," an othar began to grete;

Even now, street sellers cry their wares rather than sing them. In the '70s, a Geordie street seller on the quayside market was well known for crying "Gyet yeor Boodgies end Poopies Heyor!" (selling pets) and last week on Hitchin market, the fruit stall lady was shouting "All yer fruit! everythink a nicker!" ... living tradition.

:-)
Ian