or, you could look at older markers, which cost the same as an ion but are in many cases superior.
for the same price as an ion you can get...... old angels, probably up to an a4 fly maybe. old timmys, don't know much about them but they cost a lot new so must have something to them. old cockers, gotta love fixing them and parts are getting hard to come by but still. old dm's , these seem to hold their value but can pick up dm3's relatively cheap. oh and cant forget old shockers. again these go for nothing.
make use of the fact that things like the ion and the pmr have ruined the second hand market and buy a stupidly cheap high end gun from 3-4 years ago!