I've noticed that some prices do not correspond to the prices on TCG. For example, Jace, Memory Adept shows up as $8.77 but its average price on TCG is $17.85. This greatly affects trades and I've seen some people take advantage of this discrepancy.

I just noticed some discrepancies, too, but only off by a few cents. Those Jace numbers are a bit of a mystery.

Some weirdness was going on before today's price sync. Should be fine now for all cards.