I imagine that the companies in Montreal that have the ADOX rodinal have made some arrangement to ship it in Bulk, or have had an employee spend a few hours driving to Platsburg, to pick up a shipment and present the paper work to customs on the way back. that probably explains the difference between the US and Canadian Price, one exchange rates have been taken into account.
Blazinol is a special case as Blazes Photographic was in Canada.
(update ;
https://lightprogroup.com/pages/kindermann-canada )
All the Rodinol sold comes in plastic Bottles and I suspect it will ALL last longer if decanted into small Glass Bottles. the HDPE stuff is NOTair tight.
Consider using a heavier than air, inert gas to fill the receiving bottle, before hand, so as no oxygenation can occur because of exposure to air.
The best method that's also the easiest to do, is to, hot or contact glue the Rodinal bottle top snuggly to the center of the receiving bottle's cap, a spare, and drill a hole through both caps to create a school child's "tornado" machine, which will, when both bottles are joined by the caps, allow the contents of the Rodinal to swirl down into the receiving bottle, it's vortex becoming a "tornado in a bottle", with the inert gas replacing the Rodinal liquid in the top bottle, without additional oxygen entering the mix, ideally.
Before joining the bottles, add a bit more inert gas to both bottles, the Rodinal holding bottle getting a bit of extra gas, before the caps are first placed on it, flat bottom on the counter/table/sink and with your thumb holding the gas in the receiving bottle, invert the bottle's mouth and quickly remove your thumb to allow it to be screwed tightly onto the already capped bottle.
All that remains is to turn the bottles so the gas bottle is now on top and allow the little quid to enter the new holding bottle.
Enjoy looking for the vertex in the transferring.
When the transfer is complete, put a new, intact bottle top on the new Rodinal bottle and use as normal.
Because it's possible, think about getting a babie's medicine syringe (no needle) and caps, to join the two, bottle and syringe, while held to the flat bottom Rodinal bottle, and then draw off the needed amount of developer by way of the syringe.
Leave the tightly sealed baby's transfer cap in place on the bottle ready for the next usage.
The slight vacuum created by the use of a syringe, will allow some oxygen to enter the Rodinal bottle, but whatever inert, heavier than air gas remains in the developer's bottle will form a boundary between developer and any oxygen and you can always put more inert gas into the bottle, as you see fit.
A lot of words for a very simple precaution.