prior to deviating to the llc theory it is appropriate for the op to clarify to whom, or what business name he sent payment for goods.
edit-> I see op posted early in this thread payment was made by cc directly to "John Pasemann US Car Tools. Therefore no llc involved with purchase unless USCT is a llc.
unless I mis-understand op was not offered a "buy-in" to a llc, he was simply offered parts for a price, which price was refundable, in full, should the part not be produced.
no need to macerate and re-gurgitate a simple purchase agreement.

Last edited by srt; 11/05/13 11:16 AM.