If you want the skinny, check out the top message in this thread on the Anandtech forums. I know what you're thinking; what if it's just a BS post? Well, a quick Pricewatch query on some SDRAM seems to confirm it; not only were shipping prices about where they should be, but take a look at this link that appears for a price listing if the vendor doesn't specify shipping charges.
If you're lazy to click the link, I'll quote you a little bit: "No [shipping] price is listed either because: The dealer may not have had the time to list the price, OR... they are trying to play a game of charging excessive shipping fees to make up for the lowball price. If you call, and are quoted an outrageous fee we want to know -- and will take appropriate action."
I still managed to find some vendors that were overcharging on shipping (i.e. $21.95 for UPS Ground on a DIMM) but judging from the above, they're not going to be around very long. Let me just say the two things that I'm sure everybody else is thinking: "Woohoo!" and "About $#@!['ing time!"