What I can say, from a retailers perspective, is that there are a number of companies piecing together delivery networks and the coverage will potentially be as close to 100% as you can get, but it's not there just yet. For us at least, the free shipping threshold may change, but we plan on subsidizing it at all order sizes.
Some companies have been successful in getting B2B exemptions from the large carriers (UPS/Fedex) so this option does exist if you're big enough and can put together a compelling case to the regulatory team at those businesses.
Bearning in mind USPS is still shipping for another month, the main thing that is causing problems for businesses right now is 2-fold.
1.) The tax calculation engine you need to run the backbone on-site is expensive and a technical challenge to set up. Having been through a number of different checkouts today, there are only a handful (including us) that have this running correctly at this moment.
2.) The state-level licenses are a challenge to apply for, as some states still haven't figured out what they need you to have (California changed their requirements 48 hours before deadline!) and they're just not set up for the number of applications they will have had. For example, in Texas, we spoke to them about 2 months ago and prior to that, they had no idea that vape was now part of PACT. We have been working with a law firm to file these on our behalf, and 6 weeks ago, we were their 4th customer, by the end of last week they were up to 50. So a huge number of businesses just left it very late to get moving on what was going to be inevitable.