I'm no fan of "flippers", but the base price for CG Dog Fathers (including the Desert DF) is $139.95; figure at least $10 for tax or shipping (depending on where they bought it, online or at a show). If they only bought one online, shipping was more. Also, there's insured shipping from the seller to you, figure $12, maybe $15, making the total cost for an original purchaser selling one to you about $165. It's up to you to determine if $35 is too much markup.
I wouldn't buy it, but I live very close to Knob Creek, so Busse comes to town twice a year. If I had to travel to Atlanta for Blade, that would add a LOT to my costs -- I'd probably consider it a bargain under those circumstances.