I have a blueberry farm right down the road from me, but have yet to buy blueberries from them. They charge too much for fresh. I get frozen blueberries from Walmart (3lbs bag or 1.3kg) for around $10. I have made the blueberry version several times. It gets very smooth after about six month in the bottle. This time, I wanted to really amp up the blueberry flavor, so I used the standard 6lbs in the primary, but after it had cleared, I added another three pounds of berries to the carboy---along with some oak powder. It has been soaking there for a month, and has gotten much darker, and a whole lot fruitier. I'm about to rack it off the fruit and give it another sit before bottling next month. It should be a really good one for the coming spring. After nearly running out last Spring, I have decided to produce DB on a six month advanced schedule. [Don't tell the folks in rehab!] So, I've got several versions going for next Spring already. There's the blueberry I mentioned, plus a tropical, a raspberry, a concord grape, and getting ready to start another 18 gallons of original. And i need to fit in some time and money to make that Dragon Port I'm dreaming of.... ...and a few kits. I just need more money than I've got!