You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
32Gb
Amazon?
It's where I got my one to go in my Samsung Tablet. I got a 32gb sandisk one for about £15.
Amazon are OK, just make sure it's not a dodgy re-seller.
I get most of my memory cards from MyMemory.
MyMemory are great.
I bought from amazon and got a reseller called mymemoryes, which is just mymemory it turns out. First I got the wrong thing, then I had to post it back to Jersey and finally I got the card after about two months! In the meantime I'd asked for a refund instead of the product but they ignored that mail and just sent the part anyway. Sounds like if it works its good but that wasn't my experience. Amazon were typically useless when things went wrong.
I use 7dayshop, not been let down yet, and probably as cheap as anyone.