I have been getting my boxes from the following link, search under roadside marketing and I think you will find what you need. I think you are looking for something like 'PP-010'. http://www.montepkg.com/item_show_list.asp?class=roadside&offset=60

Here is a link that might be useful: Monte Package Company

I get mine at the local farm & garden store (an independent Agway also), plus have seen them at the wholesale greenhouse supply place also.
Ann

Monte packaging has the cheapest I have found

http://www.jordanseeds.com/index.cfm?fuseaction=browse&id=39738&pageid=33

I get my berry baskets from Softco. The have divisions all over the United States. I get my wooden 1/4 peck through bushel baskets from Silver Creek Supply in Pennsylvania. I found 3 gallon pails for picking cukes,tomatoes and potatoes at ULINE . I find anything larger is hard for me to carry in the field. Softco also has plastic liners for the wooden baskets that make sales a lot easier and neater.
Happy Marketing :)

http://www.pjpmarketplace.com/Berry-Produce-Containers-s/70.htm This is the site that I found the cheapest, especially for shipping.

Here is a link that might be useful: PJP Marketplace

Nolt's Produce Supply beats PJP Market place by about $5 a case on the pulp berry tills