Get up to speed on the many aspects of wholesaling used cars, how it works, benefits and downsides, retail vs. Wholesale value, and more.This form certifies the purchase price and determines the sales tax you must pay when registering the vehicle. A "Purchase and Sale" agreement between the wholesaler and the seller? Or; An assignment contract between the wholesaler and the buyer? This episode is ALL about wholesale purchase contracts!! I wanted to find a Purchase and Sale Agreement and an Assignment Contract that I can use for wholesaling in California. This Agreement will then be filed as part of. Looking for your next new or used Chevy? Indiana does not have any one single, comprehensive business license.