i assume boty is accusative. Prodávat + accusative?
Sell somthing to someone. The first direct object is in accusative in Czech, the second object which uses "to" in English will be in dative in Czech.
Yes, in this sentence "boty"is accusative.
Could you say "boty prodávají" in some situations, like if you were already talking about shoes and wanted to say "THEY sell shoes" ?