you have to know to not cross the line of value.
Used weapons should be a quarter or half price of a New In Box blaster.
look at pictures and see if it has too many battle scars and damage.
Read the seller's description. You should know if the seller stole a description from the box, isoaker.com, sscentral, or even the new WWwiki.
if the seller says it works great, and ONLY THAT, you should ask questions.
I've made mistakes,too. I tried to get a vanquisher some time ago, but after 30minutes of test and warfare, it became the SCREAMING VANQUISHER.

I am now trying to afford a new fleet of the CPS and other great SS and WW lines, but i'm goin to be cautious now...
Feel free to make your own tips.... i'm sure many people would like to know what they're doin'...
