I just bought a set of used lug bolts on ebay for $13 and I talked to a local powder coating company who will coat them for $2 each. The used ones are in a little better shape than mine and this way I don't have to have any down time. He cautioned me that it will add a little thickness, but said I should be able to still use the same socket size on them.
BMW Lug Bolts Set of 20 E53 X5 | eBay