I had been buying my lye from the Lye Guy but either his prices went up or Wholesale Supplies Plus decided to cut theirs....either way they seem to be the cheapest as of February of 2018.
I do see that if you buy 18 pounds at once, the cost is 3.99 per 2 pounds and free shipping, which is comparable to my source. If I needed it in bulk and had other things to order from WSP, that's a good enough price that I might put in an order for NaOH from WSP. But for the hobbyist, their 2 pound bottles are $4.95 each and you don't get free shipping unless you spend more than $25.00, which is why I have never ordered lye from them.
Dennis, I forgot to mention that I have been fortunate to find that my local grocer carries Pomace Olive Oil, so I started buying it there rather than pay shipping elsewhere. However, other than in New York City, it is the only time I have ever seen pomace OO for sale in a grocery store. Perhaps if you check your local grocers you might discover some really good finds as well. Also, I have never purchased CO except for Fractionated CO from any of the online vendors, because I have been fortunate enough to find really good deals on it in nearby stores. Since CO has such a long shelf life, I don't worry about how old the CO might be in a big box store.
If you attend any of the soap gatherings/conferences that Essential Depot sponsors and has a vendor booth at, they seem to always offer discounted prices to attendees and will take pre-conference orders and deliver at the conference with no shipping fee. Then they tend to reduce the prices of extra products they bring to the conferences making the prices really affordable. Another good reason to attend soapmaking conferences. At least that has been my experience at every one I have been to so far, but I don't go to the every high-priced conferences because I can't justify the cost, so I don't know if they do that at all of them.
Also watch the Shopping Recommendations forum here because when members learn about special deals, they often post there. Riceland had a free shipping event last year that some of us took advantage of for a really good deal on Rice Bran Oil.