If you want really high quality professional samples then you're going to have to pay for them, if someone's doing something professionally then they need to get paid or they won't be able to continue their profession.
I'd recommend the Goldbaby samples, they're the best available in my opinion. http://www.goldbaby.co.nz/products.html
If you want free samples you're going to have to expect that they're not going to sound as good but that's the trade off. I'd recommend clicking the stickied topic in this forum, "Links to Free Samples in here", it has links to free samples in it.