(This is my first post so go easy)
I ordered one of these a couple of days ago (still haven't received it), and wanted to share the price with you.
It might be a misprice - Class 6 Cards are faster, and usually slightly more expensive, but here, the Class 6 card is the cheapest of the bunch.
Anyways, Integral is a reputable brand, and this is the best price I've seen for a branded 8 gig SDHC card.
Go through Quidco for 6% cashback; mine is already validated.