As does Nashbar, since shipping is $5.99. Actually, that brings the total to $19.46 for four tubes - I'm not sure which tubes you're looking at at Pricepoint - I see them at $3.49, so for 4, with $5.75 shipping, that's $19.71, which is more than Nashbar...
So if you buy 4, it's $19.46 from Nashbar and $19.71 from Pricepoint (both shipped)
If you buy 8, it's $33.93 shipped from Nashbar and $34.87 shipped from Pricepoint
(pricepoint will also price match, so you can probably get them to knock the $0.25 off...

)