i found a set of koni yellow for sale and the (2) front shocks are bad and was wondering if its easy to rebuild then or find a place to rebuilt then.....

the seller is asking $100 for all 4. Or is it just better to buy new ones......?

 

no its not worth it.

 

It costs approx. $120 per shock to be rebuilt and painted. So roughly $300 shipped to have them done. Not to mention it will likely take atleast a month to have it done and get them back. So you're looking at atleast $400 and a month wait period.

If you ask me it'd be better to save money for a month and buy them new.. For $650 you can get them new and it'll be ready to install sooner.
If you decide to get them, I can recommend True Choice. They are one of only a couple authorized Koni rebuilders around. I had my Konis revalved by True Choice and it cost, IIRC, about $550.