He does charged more but the shipping fee makes up for the extra hundreds of dollars more, I am not close to making decision yet, I am on my way to test his own out, if nothing happens I will prefer to buy here. Thank you 
Mining equipment can take a month or so to arrive, but if you buy the equipment today and start mining, you'll earn additional profit.
These are important factors to consider.
Why is your friend selling the ASIC? Some ASICs malfunction.
If I were you, I would negotiate the price and show offers from trusted stores.
In my country, it's very difficult to sell equipment to a newbie. No one knows them, and even if they have a perfect ASIC, a regular miner would be better off buying equipment from a reputable store. Selling an ASIC to a newbie without a 20-30% discount will be very difficult. I don't know your market or your rules for selling used equipment, but somehow I'm sure your friend won't have many customers buying ASICs at market price.
Taking these two factors into account, you can negotiate a better price.
well we do not know where the op lives.
and shipping varies. altairtech.io 
is really good if you live in USA
as shipping is fairly cheap.
and they do deliver fast if they say it is in stock.
but if the op is not in the USA there are a ton of other issues. about buying.
Since the op did not mention his or hers country it is hard to let him know what to do.