PlayUSA.com tends to be cheaper... but you don't know for sure what is & isn't region free, as they simply state that everything is "Region 1"(sic), even though some stuff they sell is definitely region free (e.g. Watchmen Director's Cut - I bought it from them last week, works perfectly on my UK PS3 despite PlayUSA.com claiming it's "R1 - Will only play on North American Blu-ray players").
If you use Movietyme, you *know* which ones are region free.
Someone pointed out in the Watchmen DC thread that there can be a problem with checking Movietyme to see if something is region free, and then ordering it cheaper from PlayUSA.com instead: Movietyme sell US discs & PlayUSA.com sell Canadian discs. Generally, that doesn't matter, but apparently there have been instances where the US release of something has been region free while the Canadian release has actually been locked to Region A.
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If you use Movietyme, you *know* which ones are region free.
Someone pointed out in the Watchmen DC thread that there can be a problem with checking Movietyme to see if something is region free, and then ordering it cheaper from PlayUSA.com instead: Movietyme sell US discs & PlayUSA.com sell Canadian discs. Generally, that doesn't matter, but apparently there have been instances where the US release of something has been region free while the Canadian release has actually been locked to Region A.