Buying bits in sets are always cheaper than buying individual bits. I've bought cheap sets from various places and I've never been disappointed. I have not purchased sets from Ebay because the shipping cost is usually pretty high. If you get carbide cutters on your bits (I consider this to be required) you should get something decent for the money you spend. I've also spent $40+ for single bits (especially bits for raised panels). Check out Rockler and MLCS for sets before you spend your money on Ebay. To be quite frank, I don't trust the quality of the router bits I just looked at on Ebay but that is just a gut feeling.