Good news, everyone!
Amazon pulled the Associates program for all members residing in Missouri when Missouri passed a bill making each Amazon Associate an affiliated entity with Amazon, thus giving Amazon a physical presence in the state, thus meaning that Amazon had to collect sales tax.
Well now that Amazon is collecting state sales tax everywhere there’s no reason to hold it against us Missourians (or any other state which passed a similar bill) any longer. And they’re not – the affiliate program is open to Missourians again. You just have to reapply.