Everything Old Is New Again

I'm looking for a DVD to buy online for my Aunt.  She can't find it anywhere, and I find it for her on Amazon.ca.  It's a little movie called Undertaker Wedding.  Nothing special.  You can get the DVD from just over $5 according to Amazon...or the VHS for $25?!?  What the hell?

Even better than that, you can get it NEW from $5.84...but used on DVD?  Well, that's going for $24.65!  Where do these guys get their info from?  Are these resellers NOT Amazon users at all?  Does Amazon cull this data without their knowledge?  If they did, I'm sure it could be understood...but if not, who in their right mind would think they could get FIVE TIMES the value of the item brand new!