That's a shitty price. Also, the seller is too new and has too low of feedback count. He will most likely take your money, empty his bank account in cut & run scam, and you'll wait for about a 2 months time for eBay to refund your stolen payment.
Get the flashcart at nds-card.com,
or if you want cheap ntrboot capable flashcart,
or switch over to nds-bootstrap,