It depends on what kind of it is, how much you paid for it and what condition it is in. As well as any upgrades.
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If you know how to work on broken paintball guns, you can get a lot of great deals at local pawnshops. Also many fields have used guns to buy.
Used paintball equipment can be bought from online mega-retailers such as Amazon or eBay. Specialist websites such as Just Paintball or Trade My Gun do also sell used paintball equipment.
A fairly basic paintball gun should cost in the region of $70 - $120. A price lower than this would certainly be considered cheap, however the quality may be quite poor.