Double Taxation Question

[cebula13]

Iowa,

Say I run a business that posts mid- range prices on the internet. Upon an order from a customer, I find the cheapest product and order it paying sales tax. After receiving the product, I ship it to the customer, charging sales tax. Without a resale certificate, how can I avoid this? Tax returns?

 

[cebula13]

Does anybody know? Can I just put the sales tax that I pay for the first sale as a tax deduction? As you can probably tell, I'm new to this.