That does not sound right. When you go on their site it comes up to $60 for a single and $120 for a double kit. When i bought mine in January, they were on sale at $50 for one and $100 for 2, I took the double kit so I had spares and also shipping was the same price for either option.
Just noticed that mine are 1800lm and the ones he lists now are 2800lm, that may explain the raise in price.