Just wanted to update my thread to answer the tax question as well as pay a compliment to Crucial.
The reason they charge tax is that they in fact have a physical presence in North Carolina. They list all the states they have a presence in on their website. As such, you have to collect sales tax. No biggie, as for the 16gb set I bought, the sales tax was < $7
And a huge COMPLIMENT to Crucial's customer service. The day after I ordered the RAM, I received an email apologizing that the site didn't update their inventory as quick as they were selling it and that they would notify me when it came available. I responded back that it fine and to just keep me posted. I asked if they upgrade shipping options in a situation like this. I just selected the standard "free" shipping so I figured they would move it up one selection to ground or possibly 3 day. Nope, they skipped over those as well as 2 day as well as overnight. I was upgraded to the priority overnight.
I told them I didn't expect that and I truly appreciate a company that takes care of their customers like that. They have a customer for life in me!
And by the way, my RAM was in stock 2 days later and was at my door before 10am the next morning.
WAY TO GO CRUCIAL!!!