Prices vary often in many of the online shops. You could check Quiltshops.com Check out the weekly specials, sign up for email newsletters, etc. I get tons of ads and many of them have great sales.
http://www.quiltshops.com/cgi-server...s/qsnews-a.cgi
I recently got some Tonga Batik strip packs from Fat Quarter Shop for about $20. I've seen them up to about $35-42 lately. I wish I had bought more! Ebay is another place I've gotten some...you have to be careful to check the quantity of strips though. Sometimes it won't be the standard 40-42 strips.