shipping into Maryland from a winery is illegal. If you are personally in California, say, I believe it is permissible to buy some wine at a winter, schlep it personally to a wine shipping site, and send it to yourself.
However, efforts are underway to change this.
There is a thread on "wine conversations" here right now discussing proposed legislation in Maryland.
This is a link to the bill.
But, go to the wine conversations thread (https://forums.winespectator.com/eve/forums/a/tpc/f/6826053161/m/402102984) and scroll to the end to see how you can really help.