From what I usually see on the threads here, most hybrids sell for 50,000 IGB each. Purple pansies and blue roses sell for 100,000 IGB each since they are harder to breed. Gold roses sell for 200,000 bells each since you have to turn the perfect town ordinance off to breed them and have to wait for black roses to wilt and water them. These are the prices I see on average. Of course some get sold for more or less depending on how desperate the buyer or seller is. Since 1 TBT is worth about 100,000 IGB, the easy to grow hybrids sell for 0.5 TBT each, purple pansies and blue roses go for 1 TBT each, and golden roses go for 2 TBT each.