Here is a very good (and affordable) alternative to the Vex FL-8. I bought this unit used two years ago and believe it to be 4-5 years old. The unit has a newer battery (replaced just before I bought it). There are a couple small scratches, not visible in the pics, in the black area (between the 6 & 8) that have been filled in with a black marker. Comes with charger and original instruction book. $100 + shipping to your location.
The ClearWater is an LCD flasher, which is quieter and draws less battery power than a Vex. Here are some other comparisons to a vex:
Output power: 1000 watts p/p .... Vex - 400 watts p/p
Current draw: 50ma ...... Vex - 275 ma
Target seperation: 2.5" .... Vex - 2.65"
The Zercom unit is a greyscale unit. Meaning targets show up in grey or black depending on their signal strength. Obviously it is a little more difficult to see the differences than on a vex.