Well 300 is a good price for well grown, flushed, trimmed, sensi, actually 400 is good too. The problem is most people sell wet, unflushed, sometimes not trimmed, bud for that same price. It is really a hit and miss unless you know someone who is reliable grower/dealer, that has the same quality nugs for the same price all the time, and those people are hard to come by.
I suggest buying mids or even bricked weed, because I have had amazing mexi/import bud that kicks the ass out of peoples dank in all departments (taste, smell, high) It is a lot cheaper and 90% of the time its damn good.
Starting out I didn't get such great bud and it was usually swag but I've been buyin for 6 plus years and buying in good quantity for 1-2 years, so I have found the good connects, but they are out there, and even when I have my own that I grew I still like to have a bag of regs to puff on to break the monotimy of smoking the same shit, or to prevent getting burnout from the high.
Variety is the spice of life, I love trying all different nugs, whether it be my own grown, someone elses, or commercial buds, you can find shitty and amazing things in all the catagories (well my own is always good, but sometimes i get dissapointed w/ the strain if i go out on a limb and grow something I dont know that well)
edit:
Prices
Dank: 50 and 1/8 no price breaks, lol one time the dude told me it would be an extra 50 to buy an ounce lol 450
mexi: 300 for a qp, so like 90 an O
other mids or w/e we get are actually just mexi weed that looks better and not as compressed but go for about the same maybe 400 a qp/125-150 oz at most and usually are more indica.