Newegg has them for $35.99 plus shipping (free shipping if you have Newegg Premier). That's probably the cheapest for a single kit. You might be able to find them a bit cheaper on eBay. If you want to buy 10 sets (MCP-290-00052-0N-Bulk), you can get them for around $225, and could sell the nine sets you don't need for a little profit.