yeah, that's what they are attempting to charge for them... it's a load of bull. i actually emailed one of those vendors and asked why they charge so much and they layed some load of crap on me about supply and demand.... whatever. Just go here--> https://www.netforumondemand.com/eWeb/Shopping/Shopping.aspx?Cart=0&Site=soobahkdo and you can get them all for a morereasonable, albiet still a little high (nowhere even in the vicintity of 300$ or 500$) non-federation member price.
you can also do what i did... just check on ebay as those books pop up in auctions from time to time... i got the red belt instructional guide for 10 bucks that way