Great post idea.
Perhaps we could start a post with ideas about what is a reasonable "bunch" of different veggies and herbs. When you don't have a certified scale, you're required to sell products by the each, head, bunch, container, etc.
I know the prices will vary based on each market, but it would give folks a good idea of pricing.
I like Walter's idea of canvassing the market and noting prices.
In past years, I've gone to the local grocery and actually counted, and or weighed items, noting how much is in a bunch, or container, and then computed my prices.
I think the most variance comes in lettuces and herbs.