That is a good price, they cost 20-22 (that's in British pounds, equivalent to about $30) if you buy from the source:
http://www.sheffieldknives.co.uk/acatalog/Folding_Knives.html

These knives are so tough even buying second-hand might be a viable option. I've seen surplus clasp knives sold at pretty low price, many in excellent, barely used condition.

$30 is not dirt cheap but IMHO well worth the money. Keep in mind it's the real deal, made in Sheffield - once the cutlery capital of the world, still known for superb blades. These are built to last many decades of serious use. I've seen heavily worn examples that have been in nearly constant use/abuse since WWII and are still going strong. A SAK may have more functions but the Brit clasp knife is going to be just as practical and more durable if the quality is anywhere near what it used to be.