Variable pricing, or "smoothing," means the Coke machine is set to automatically raise its prices when it's hotter outside. Amazon and other online businesses use it all the time based on some odd algorithms, but for some reason I don't expect to see it in online gun purchases.
I went to budsgunshop to check their prices, found what they were and went to Tombstone Tactical, which had a good price on the piece earlier, and found their price right up there with Buds, $20 more than an hour or so before. So, since I already had an account with Buds I went ahead and placed my order there.
Then, just for grins, I deleted all my cookies and went back to Tombstone and found it even lower than previously, and lower than Buds, as I expected. $20 isn't enough to convince me to do business with businesses that do that (except Amazon, because I need them more than they need me). Funny thing, it's possible Buds does the same thing, but I've never caught them at it when I was actually ordering.
Oh, and using a Mac instead of a PC is one characteristic that causes pricing to be higher. I guess they figure anyone with a Mac has lot of extra money to spend...