Abu Garcia Ambassadeur 6600 bcx is the cheapest Abu you can find with a clicker. They sell new at Wal Mart for around $60 but you can find them on ebay for less.
I would suggest getting an older Ambassadeur 6000 or 7000 series depending on what you want to spend. The older ones last longer in my opinion and I have always had the best luck with Ambassadeurs over other brands.
You can look on ebay or the boards at bass boat central if youre looking for used reels. Bass Pro has a decent selection if you want to get a look at each reel before buying or if you wanna buy one new.