Where to find M8 furniture fasteners/connector bolts (US)

I've search all the usual suspects, and I might just be bad at searching but having difficulty finding two different types of M8 bolts.

First, I'm looking for a flat head furniture connector that isn't countersunk... I've seen these called ultra-low profile socket bolts, furniture connectors, flathead bolts. Spec needs to be M8-1.25, at least 30mm long. I don't mind if its partially or fully threaded, as long as its got at least 10mm of thread. Examples of what I've found:

http://www.theinsertcompany.com/flathead_connector_bolts.php

https://www.ebay.com/itm/M6-M8-A2-304-Stainless-Allen-Hex-Drive-Furniture-Connector-Screws-Fixing-Bolt/184055370595?hash=item2ada8e1363:m:mUsqMmsVNoRWFUY1nLuebeQ - Shipping from China is pretty slow currently, so I'd rather just get button head bolts than wait on these if I can't find anything else...

Second connector is a double-ended M8 bolt. At least 50 mm long, 20mm threads with 10mm non-threaded in the middle (if its 50mm, threaded dimensions can be longer) but that's not necessary. I found this but was hoping for galvanized or stainless https://www.grainger.com/product/TE-CO-Double-End-Threaded-Stud-1DV84 .

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