The ones from Joann's are not the same as the Kaufman Kona Solids. If you compare them side by side, you will see the difference. The Kaufman ones are thicker, press up really nice and are great to work with.
Check out this link. You can search and check prices from many places all in one search. I've seen them for under $5 yard.
http://search.myquiltshops.com/cgi-s...tion=newsearch