There's adapters on Ebay for like $10 to refill 1 pounders from a 20 yourself.
The adapters are also available on Amazon for a few dollars more and free shipping if you have Prime.
Here is the adapter I purchased.
https://www.amazon.ca/RioRand-Propane-Adapter-Cylinder-Coupler/dp/B01FVI2L8O
https://www.ebay.ca/itm/BBQ-Grill-S...025332?hash=item23798b43b4:g:wIMAAOSw2xRYWLb~
I went with the one below because I liked the big plastic knob, the ones you showed from amazon are under $8 with shipping on Ebay.
https://www.ebay.ca/itm/1-LB-Gas-Pr...388432?hash=item3d2f871ad0:g:IV0AAOSw44BYa0e1