I use the USPS shipping plugin. I have it configured to ship packages domestically by USPS Priority Mail. (For reasons I don’t understand, but it doesn’t seem to matter, I cannot deselect First-Class Mail Large Envelope.)
My site has 2 products that are a lot smaller than the other products sold on my site. I can ship these smaller products in a padded envelope, but, because of the thickness, USPS considers it to be a package. I would like to offer my customers the choice to save money and ship these small items by USPS First-Class Mail Parcel shipping, in addition to USPS Priority Mail.
Is it possible to offer USPS First-Class Mail Parcel shipping for only these specific products and if only not more than a certain number of these products are bought? I do not want to offer USPS First-Class Mail Parcel shipping for any other products. If these small products are bought together with other products, then only USPS Priority Mail (and not First-Class) should be available.
