I always use new bolts and it costs me around $14 total for the complete set
. I first buy them from FCPEURO and with their lifetime replacement warranty, I always get new ones when I turn in the old ones, and my only cost is shipping costs which is around $7 each way. Guaranteed replacement and no questions asked. Their prices may be a few dollars more than other online vendors but they're still way, way cheaper than the dealer, but given the lifetime warranty, it's a no-brainer to buy from them.