To the OP:
Since I don't know where "Oz" is I can't really comment on your specific situation, but I can see how you can find US-based merchant's prices high, especially recently when carriers started imposing surcharges due to fuel costs increases in the US.
But, I've been just charged $17 to ship 2 SHM-SACDs from Japan in Mini-LP format (cardboard sleeves), which are lighter than traditional CDs. And yes, I've paid PP fees on top of it. On Ebay "SAL" shipping for the same CD costs $3 apiece. But if it doesn't arrive for any reason, there is no liability coverage. My luck hasn't been all that great lately.
Ray only uses FedEx so I have no doubt you've been charged actual cost based on your presumably OCONUS location. I'm not even a merchant but as I upgrade my stuff I always sell something. I can tell you that under no circumstances would I ship USPS or even UPS unless the buyer requested it for some specific reason (have an account or something). The issue is liability and mutual assurance, or lack of it. How would you feel if he charged $10 or $15 and if the amp doesn't arrive he would say "sorry, I've sent it such an such date and here is the record." If I buy something from Ray, I just send him a check. No fee, no issues. But not everybody is willing to do that and it's fine.
Mega-merchants like Amazon have done a huge disservice to small businesses, IMHO. They have ingrained into people that shipping should be "FREE." Nothing is free. I sent a document to Hong Kong recently in a FedEx envelope using "Economy" International service for $35. That's right, a document. Even if it's a small box, there is handling, tracking and shipping involved and in the end someone needs to physically deliver it burning expensive fossil fuels in most cases.
It's my guess that we will see shipping price increases soon from a lot of US-based vendors and I'm sure it won't be because of greed or malicious intent. There is only so much you can absorb on profit margin when you're not a volume seller, I'd imagine. The MOTs here know better. I would personally not let $20-$30 extra to drive me to a less desirable and perhaps lesser quality product just because they shipping charges are more reasonable, but that's just me. I would drive myself nuts thinking about how much better the other amp would have performed. But the choice is up to you, of course.