If almost everything is hidden under "offer", it's going to be incredibly difficult to do a comparison.
The only comparison I could do is:
4670k + Gigabyte UD3H
Tradepac: $600
Amazon (incl. shipping): $560
Cost difference: $40
WD Caviar Black 2TB
Tradepac: $191
Amazon: $137.57
Cost difference: $53.43
Overall savings (excl. Tradepac discount if any): $93.43
Take note that UD3H was my first choice, but right now I'm going to adopt a wait-and-see attitude depending on which R9 290 non-ref model I'm getting.
From a basic Google search on Intel CPU, Gigabyte mobo and my knowledge of WD, it is possible to get Intl Warranty. Again, not that I'm too fussed about it, but for those who are interested.
I agree that getting a CPU + Mobo from amazon is arguable despite the minor cost savings, but because this trend continues (based on other price lists from SLS shops) for other components, the cost savings can be rather significant, especially since the best thing SLS has when it comes to pricing is the CPU + Mobo combo.
Steel Series Sensei RAW mouse for example, SLS listed price is $129, I got it for $64.
I am hesitant to do an overall price comparison with specific shops because I don't want to offend any SLS vendors here.
Tradepac will be a shop I'll consider for my GPU, mobo and casing.