It is very unprofessional at the least to "agree" to a deal while also saying you need to think about it. That would not get you very far at a convention or apparently on these boards. You simply do the research and then make a final decision on the deal going forward. Hell, this would be frowned upon in any business transaction. Could you imagine leaving a used car salesman with that? Bad deal but also Hulk 181 is overpriced. While there are fewer hulk 181s in higher grade, as in every book, they are always for sale and extremely common being from the bronze age. I can find a 9.2 cgc hulk 181 every day of the year on an auction house.