if you are not dedicated to a particular brand, I have had real good results with transcend.
I own one of their flash cards, and have their computer memory in two of my computers.
I was surprised at how inexpensive memory had gotten.
I just purchased four 4GB cards today from newegg. 45 per card, with 2nd day, came out to 198 and change.
They have their 8GB cards for 80 and change.
Pardon the info if you are already familiar with it, but I have always been very happy with newegg, (
http://www.newegg.com )so I rarely even look anywhere else. Back before I started using them, I had price shopped all over the place, and they were among the best prices. Their reputation as an online retailer is very good as well. It is the same reason that I have pretty much stopped looking anywhere else but
B&H. I am happy with them, and have seen plenty of evidence that they are going to be near the bottom price you can find, so I stick with them.