What is the (Approx) cost to have 2 outer tie rods and one inner?

It is something you can do yourself. But, I would reccomend replacing both inners instead of just the one because the parts were most likely put on at the same time and should be replaced at the same time. Just due to regular wear and tear. And also you won't have to worry about replacing it in the near future or an old part wearing out a new one. Cost to do-it-yourself $200 - $300.

You are looking at about $1000, unless you have a mechanic that likes you, as far as doing it yourself it depends on the tie rods some require special tools some dont, if yours doesn't need special tools then the cost would be probably $200 or less. You will stil have to pay to have it aligned even if you change them out yourself, That would probably be included in the price of having a mechanic change them out, I would suggest having it done far fewer headaches that way.

generally, you will pay for parts, labor, and alignment, i have seen accord prices for both outers and one inner with labor and alignment in the $350 range. you can do the outters yourself, but the inner requires a special tool, but you will still need to have the car aligned afterwords.