You can still order online. Check to see who they are using to ship and if they offer shipping to your location. If using a US based vape company you will have to be home to accept and sign for a package.
Per the PACT Act vape gear is no longer allowed to be shipped via USPS. DHL, FedEx and UPS also jumped on that bandwagon. Some foreign companies still ship via USPS, DHL, FedEx and UPS using very creative declarations.
I haven't ordered anything in the US since just before the PACT Act went into effect. IMO it is no longer worth the hassle of buying in the US.
You can still buy nic. But time is likely short. UncleJunkle has a blog page showing which companies are still selling 100mg nic.
List of US Retailers Still Shipping 100mg Nicotine Base | E-Cigarette Forum
IMO your best bet is to purchase vape gear from FastTech, Sourcemore or HealthCabin. Shipping from those varies from person to person. Some receive orders in as little as 14 days while others take up to 30 days. I haven't ordered from any of those places since last year.
All my orders for vape gear stretching back some time have come from Europe, Malaysia, the Philippines and Australia. Each order has been direct from a manufacturer. I received an order from Atmizoo (Greece) last week via DHL.