So what do they weigh it as? They use Imperial measurements instead of Metric or something?

Maybe they mean they don't sell single grams. All the dealers I've ever had, except one, didn't sell anything less than an 1/8. The guy I know now doesn't sell anything under a 1/4. There are plenty of sellers out there who don't sell single grams.

I'm sure that's what he meant, because how else would you weigh it as?