I've seen questions about this so I thought I'd start a thread. Starting oxygen is really intimidating for folks who aren't medical professionals or welders. My oxygen supplier Vitalaire wants to charge us CAN$62/month for each regulator >:( , so I've been working on getting our own.

We are mostly using M tanks, but we keep an E tank ready to be more portable (tanks shown and described here: START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or END PRINTPAGE)

We bought an E tank regulator from ebay seller lonlon2 :
HCS8715M Medline 1 EA/EA REGULATOR 0-15 LPM 870 CGA CONNECTION Medline
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~ my husband is satisfied with this, though many find higher flow to work better

We are going to buy this adapter so that we can use the E regulator on the M tank:
TA-870-P Transfill Adapter - Allow the connection of CGA-870 (medical-style post valve) cylinders and devices to connect to CGA-540 cylinders and devices.
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More experienced folks may have better recommendations than mine.

Would it make more sense to buy an M tank regulator rather than adapter? Any recommendations of M tank regulators?

These work well.....
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I can't get your E tank reg link to open, but here's a good price on a 25 lpm... START PRINTPAGEMultimedia File Viewing and Clickable Links are available for Registered Members only!!  You need to or END PRINTPAGE

And...if you really want more flow on a 870 reg...
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Racer, thanks very much! I'll have to check if Harbour Freight ships to Canada (the amazon one doesn't).

I think I fixed the image (it wasn't supposed to display as a link).

cheap on ebay. i have three. two in my cars and one in the house. i think i paid 20 bucks for one and less for the other.

Great. This is exactly what I was looking for as well. Thanks  :)