Hello to all Central Mo brewers. I'm a Jefferson City Resident myself, but I am in Columbia quite often as that is where my office is located.
And yeah, BoCoMo is quite sketch. I think the proprietor was recently incarcerated due to a side business involving the distribution of artificial marijuana.
HyVee is ok if you are in a pinch, but I generally avoid them as their selection is quite small, and I'm about 95% sure that the last can of extract that I purchased there was about 2 years past expiration.
Your best bet for supplies is to plan well ahead, and order. Lucky for me my brother in-law is one of my co-brewers and he lives in StL. Other than than Midwest and Northern Brewer are my two major suppliers.
I recently went all grain and have become quite accustomed to purchasing the 50lb sacks of base malt when im in StL. If all you need to order are the specialty grains, hops and yeast then the price of shipping isn't too bad.
My advice if you are going to be a mid Mo brewer, move to all grain as fast as is reasonable, plan ahead, and buy in bulk.
Cheers.