I've brought a used Smart Parts Impulse as my first marker, came with a full freak barrel kit, spares, original barrel, and a few nice ups, like a blade trigger, derlin bolt (means you dont need to lubricate it) and a lightweight hammer to increase effiency of the marker. Got it from the classifieds here.
Cost me all of £83 posted.
If you feel a little.. worried about sending out a fair bit of money to someone you dont know, dont, I did. I've since learnt that 99.99% of the time everything goes well here on P8ntballer, tis a good community.
Good luck with your first marker