engine - 4:54 pm on Jan 4, 2013 (gmt 0)
I guess it also depends on other factors, such as if delivery is extra. I've seen many products at a lower price only to find the seller adds on a hefty shipping fee.
Additionally, where are they shipping from? I had a recent purchase described as in stock. It was in stock, but in China. Incredibly, it was free delivery, and shipped via UPS, but took about two weeks to arrive.
Taxes are a lot lower in some countries, and import duty may not be included in the cost.
One other option sellers might hope for is an upsell, or sale of another product from their range, thereby making up the loss leader.