Suppose a company were interested in purchasing a large quantity of crude oil futures, with the intention of taking delivery. What might they need to consider that isn't an issue for retail traders? Transport is presumably one of these.
Is there a size at which an open-market purchase might no longer be advisable? I'd appreciate direction to any resources on these topics.
Is there a size at which an open-market purchase might no longer be advisable? I'd appreciate direction to any resources on these topics.

However I do not, beyond some knowledge of Incoterms. I'd like to familiarize myself a little bit if possible.