This site is very helpful if you plan a trip to a foreign country. They also have a very good mobile site (but unfortunately not a single app for blackberry), which makes their service available on the road. The reviews can be trusted as they can be reported if they look fake/paid
Ebay is a great place to buy supercheap products (especially those from Hong Kong sellers), and it's also the best place to find rare products. They have a very mature review system, which helps you buy safely. I recommend not to have big expectation while buying brand-named products suspiciously, because they are most probably fake. Ebay doesn't really look like doing anything about this.
I typically only use hostelworld to find the best place based on reviews, then I book it on hostelbookers, since there is no booking fee there. However, hostelworld also has a mobile site, which definitely makes their service better compared to [link].
To be honest, I think the booking fee should be paid by the hostels, not the customers. Using the little trick above helps you avoid paying this annoying fee
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