Where the hell do you guys ‘low key’ pick up r410a refrigerant from??

Yer man is struggling to find a plug trustworthy enough to do the job so I have all the kit, have researched the process behind it - and now I’ve found I have surprising few (zip, none, nada) contacts who work in refrigeration...

I see some people have said they can buy online but I’m struggling to find a source (these are obviously people selling writhing tucking the regulatory boxes...)

And help much appreciated!