the cheap one is us post office flat rate medium box I think that is about 6 to 10 days to most of the world.
fedex is fedex one is faster then the other.
one is about 6 days the other is about 3 days
what country are you in?
I am in EUROPE, so I don't know If i can take that flat rate 75 USD shipping, also I don't intend to pay tax to them because tax will be payed to my customs when it arrives to my country.
Also because my customs will be charging me TAX on complete value (Goods + shipping) it important to say that if i buy something for 200USD and shipping is 150 USD, customs will be charging TAX on 350 USD.
Because of that I don't want to for someone to return me overpriced shipping later because my expense would be expanded to bigger proportions because of VAT.
I think this is so unprofessional to start major operation without testing the web shop.