Many just grow their own nowadays. They make small hobby gardens with the weed today, growing different strains. They treat them like tiny high-end wine vineyards, prized vegetables etc. If they do it right, it doesn’t take much to get a year long supply, maybe a couple of plants will do it.
And many did this because like all commodities, the government got greedy and the retail distributors just passed off all the government taxes/regulation costs to the consumers. According to the co-owner of a dispensary I talked to, she said many people just said eff that and started to grow their own.
I doubt many people are growing their own. 80 - 90% of pot is still going through the same illegal dealers.