Hi, Those at brambleberry are a good price but they fill from the botto which scares me a bit.
Please Note: These tubes are bottom fill style containers. To fill, make sure the dome cap is in place and put on the cap, then flip the container upside down. Using a dropper or a long funnel fill the container using one of the 2 holes in the bottom. Allow your product to set-up completely before flipping over right side up.
I use them for deodorants which are thick from baking soda, so I think I would have problems pouring through a fuuel, etc.