I know that we (team 3502) have looked into this because it would make our fundraising/spending a lot easier. For one thing, because we are affiliated with a school, they want to know everything and anything that we buy. They even almost insisted on a proposed "budget" with every nut and bolt. We eventually said, if you want all this ahead of build season, let's just put the entire AM, VEX, and McMaster inventory on the list, because there's no way to know before the challenge
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Back to the topic, the school also has some issue with us separating from them, and that is making the process a lot harder. A professional would really help.
Good Luck!