I am impressed with your close analysis of the UCC! Unfortunately, you took a couple wrong turns. As a threshold matter, the UCC is not a federal code. It is a uniform set of laws enacted to a greater or lesser extent in many states. Also, it may not even be relevant here. I'm happy to help guide you through from the beginning if you're truly interested in getting the correct answer.
Let's begin like this:
Ignore the UCC for the moment. Cut and paste the text of the specific terms of the contract you entered into with BFL. When you purchased your hardware, did you ever click "I agree to terms and conditions" or something of the like? If so, that's your starting point. The express written agreement of the parties overrides the UCC in almost all instances, so let's start there.
Second: Having read the conversation in your link, it seems the complaint with BFL is that it unilaterally cancelled your order. If that is the case, then you are trying to answer the question "was BFL's cancellation of your order a breach of the contract, and if it was, what is the measure of damages." This will be very important going forward.
Looking forward to seeing your response!
I am trying my best to keep this independent of a direct discussion of BFL itself. I really just want the community to consider legal rights independent of the emotion of a specific case, but as a tool for risk management. I'm a firm believer that an educated customer is an asset and an uneducated customer is a liability. Additionally, to be clear, this did not happen to me. I currently have no complaint against BFL. We have already have at least 1 thread talking about the specifics of that instance.
That being said, you are dead on that UCC on a federal level is merely a legal framework that was an attempt to unify/structure state regulation (my understanding is prior to this trade regulations were all over the board) and is preceded by state implementation. The federal expression only seems to have effect if it's not defined on a state level (anybody confirm or deny this?). In the specific instance your talking about, I do not believe (haven't been able to find) where there are any overriding "terms and conditions" aside from no-refunds and a "currently scheduled" date which were on the page at the time of ordering. Though, I'd really like discuss this on a more abstract level for general consumer awareness sake
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Great input
lets keep this rolling
Edit: in this case when talking about the specifics I'm referring to Missouri's implementation, not the Federal framework