I went to the grocery store to pick up a few things for this weekend's dinner party and I noticed a few of these yellow fruits with the loose limes. They look like limes, but are yellow like lemons. Produce guy said they were a new kind of lemon, sweeter than regular lemons. They didn't even have a price, so he just charged me the same price as the regular limes. They do seem to have a rather thin rind. Anyway, I'm wondering if these might be sweet limes. I've done Google Image, but there aren't that many pictures (though they do resemble the pic at Purdue's horticulture site, just more solidly yellow). Might they be sweet limes?