This set is region free therefore you can buy it from amazon.co.uk for 24 pounds (on checkout, they'll remove their taxes and add 3 pounds shipping) which ends up less than $40 shipped (there is a very small change that the US/Canada will charge import taxes but for something of this price they usually don't).
3 weeks ago I bought the Alien Anthology from there for 17 pounds (it's still this price) and with shipping and conversion it ended up being $28
(I didn't get charged import taxes) The only difference is that the US release comes in a digibook (like Star Wars) and the UK comes in a 6 disc blu ray case but for the price, I'll live