A used Smart parts Ion can be sold for around 100-200 dollars depending on condition and what your willing to sell with it.
There are a few places where someone could purchase a Smart Parts Ion paintball gun. A store like Sears, and websites such as trademygun, and ultimatepaintball, all sell Smart Parts Ion paintball guns.
the smart parts ion is by far a better gun. the vibe is a waste of money. the ion is a little more expensive but you won't go wrong with it.
The Smart Parts Ion is a fantastic gun, in the sense it can be upgraded easily and it is not the most expensive gun. There are not nearly as many upgrades for the Piranha.
a new feed neck or a drop forward
The Ion is considered higher end with a different bolt style, body, board, feedneck, and barrel. The Ion is also much better on air and faster. Though the aftermarket upgrades are very similar.
An Ion is short for the marker, the smart parts "ION." It is an electro-pneumatic marker with impulse barrel threads, ion feedneck threads, and reverse threaded regulator threads. The classic ion cost about $200, where the new ION XE costs about $220.
Smart Parts (Now GoG) made mid level electronic guns. The Ion series (now eNMEy) was a popular, relatively inexpensive speed ball marker with huge customization and potential for high fire rates. The SP1 was an Ion with a more tactical looking rugged exterior and good customization for woodsball. Both series were relatively cheap for high fire rates but lower reliability.
Anything that fits in the standard feed-neck. So no A5 cyclone feed tops.
Online, or at any place that trades or buys markers.
The EOS is basically an Ion with a different body. The bolts are the same as well as the internals. The common joke with EOS's is that "It's an Ion on steroids". before sp went under they really only made 3 markers, the shocker, the impulse and the ion, everything else was a ion clone
I would recommend the SLG because with the smart parts ion u have too upgrade it a lot to make it a great gun, with the slg itz fine right out of the box it comes with a better board an asa already on the gun and a clamping feedneck.
The ion is in a different price and play range than the salvo. If you have the money for a electronic, higher tech, speed ball gun get the ion. If you are just starting out and need a durable, low maintenance gun, go with the salvo.