u/UnnecessaryPancake

Reputable sources according to this community:

EspressoOutlet.com

MiiCoffee on Amazon

Cliff and Pebble (mentioned by u/Lofi_Loki)

More of a gamble, less reputable, or straight up scams:

df64coffee.com

cmsale.com

DF64.com

AliExpress

I see posts every other day from people buying a DF64 from one of these sites and asking for help.

I bought mine from Espresso Outlet, they are fairly local to me, based in Michigan. They are helpful and knowledgeable if you run into issues with your grinder, as I did. Over a year and my DF64 is still awesome.

Edit:

From other comments:

u/Espresso-Newbie

>Adding U.K. reputable dealers > >Sigma Coffee > >Bella Barista > >Coffee Friend > >Earl Coffee > >Either taken from this sub and/or places I’ve bought things from so know they’re reputable. Earl coffee is especially great customer service i got my philos from them a few weeks back.

u/mokachill

>For Australian buyers, Alternative Brewing is legit.

u/PostwarNeptune

>Bought my DF54 in September from Eight Ounce (Canada). > >No issues at all. They've been around for a long time. I'd consider them reputable.