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I'm also a satisfied customer of MPJA. However, one needs to remember the following:
MPJA sells surplus, so unless they say that the part is new, one should assume that the part could be surplus or used.
LEDs in general, and even more so with blue and white, are recent and advancing technology, so what you may save on less expenaive LEDs may be eaten up by disappointing performance. Or worse, as I found when I bought a few LEDs: the blue ones became intermittent after a few tens of minutes of operation.
I've since purchased blue LEDs directly from Nichia, and found them to be very reliable and of excellent quality. Just a satisfied customer. ;-)