Mo. Rev. Stat. § 407.337: Assignment of contract, buyer's rights.

Whether or not the health spa has complied with the notice requirements of section 407.335, any right of action or defense arising out of a health spa contract which the buyer has against the health spa, and which would be cut off by assignment, shall not be cut off by assignment of the contract to any third party holder, whether or not the holder acquires the contract in good faith and for value.