Hey man that's great to hear, good luck! My occasional pop-up BBQ turned into a real business the week that everything hit and it's been going strong ever since. I think people are getting tired of their own cooking.
I have a connection with a local butcher, but outside of that Costco Business has been the way to go. Although...with the meat situation, the past couple of weeks have been a whole different animal. I'm having to serve what I can get, rather than what me or the crowd want exactly. Prices have also gone up, considerably so on some items- but I've been lucky as that hasn't slowed down the orders at all, in fact I have my biggest cook so far coming up this weekend. You just have to be resourceful. I've expanded the menu to make up for it, chicken is relatively easy to get here and still a decent price, pork butt is plentiful and has only gone up a little (and the extra $1/lb doesn't affect sales), pork belly is around and people love burnt ends, and buying full untrimmed spares lets me add tips along with the St.Louis racks. Everything sells out.