Depending on what it looks like, the smell, the taste, and lastly.. the potency. Plus, it depends on who's buying it from you I would suppose.. all those would be factors as to how much you would be able to get for the 4 or 5 grams that you said you were 'given'.
Generally, around here.. the commercial (beasters; commercial kb bud) goes for around $15 to $20/gram.
I got some stuff right now that goes for $30/gram. It's absolutely the best bud I've ever had.. period. I got a quarter of it (weighed 8.3 grams) for $175.. and that's a damn good price considering how good this stuff really is. Normally, a quarter of this.. (it only comes around twice per year too, so its first come first serve type of thing) but yeah, normally a quarter of this very high-grade bud would go for at least $200/quarter.
Trust me, you ppl would pay that price.. especially after taking a hit or two of it. You'd be begging for a bag of this bud after a hit or two.. guaranteed
And since it only comes around twice per year.. and its a 'first come - first serve' basis.. so its hard to get unless you 'pre-order' & 'pre-pay' for your bag. If you prepay and everything.. your guaranteed to get your bag.. if you don't prepay.. well, ehhh good luck getting some. Shit goes fast when it does come around.. I'll say that much. I've begged the guy for a few seeds.. but he won't come off of them.. bastard.
anyhow, yeah.. I would expect anywhere between $15 to $20/gram for what you have.
peace.