Three Larsen Tri-band antennas just sold on Ebay for $12.00, $14.75 and $19.95, check item # 320231870930, 270220936416 and 320231760626.
There is another guy who has them for $39.95 all the time but you can do much better.
prcguy
You might also consider the Maxrad BMAXSCAN1000. I compared these against the Larsen Tri-band and think they have an edge on out of band reception like VHF and UHF air band.
Check Ebay item # 320232099002.
prcguy