The trinity is an ok place to start, though, if you've never played the oct-mando or zouk.
Don't bother with a Fender unless you would like an instrument that you can pick around the campfire...
I recently bought a cheaper mando to take camping with me so i don't have to worry about damage to my Rose. I went to several local music stores that stocked cheaper mandos (by cheaper, I mean around $300 or so, your mileage may vary) and tried a Fender, an Ovation (real Ovation, not their Applause line), a Washburn, a Fernandez, an Ibanez, and a Samick. I eventually settled on the Ibanez for several reasons; the Ibanez was the only one made out of carved wood, the Fender and the Washburn sounded like toys until you got into the $600+ range, the Washburn had very poor highs, though the lows were ok, the Ovation felt very solid but there was something about the tone I didn't like (at least not for $389.99; it was the second most expensive in my choice lineup), the Samick...(where do I begin..) First off, dont get me wrong; in the past Samick has made some truly poor instruments at a very good price, and they've been working hard to improve their quality in recent years (and some of their more expensive lines are truly nice), but the mandos I encountered by Samick were outrageous (no offence to anyone who happens to own one)! The cheapest one available was a laminate with no truss rod in the neck, plastic bridge and tinny cheap tailpiece...it sounded ok, certainly better than one or two I had tried, but they bloody wanted almost $500 for this thing!!!! And that was Samick's "Economy" model!!!!EEeeek!!!:o

I wouldn't have given them $100 for it!
So, if you want a cheaper one...play around a bit and see what you like before you buy, (and remember that high prices dont always mean higher quality) and if you want one now, buy local, if you can stand to wait, order one.
Here's a link to some great builders
http://www.mandolincafe.com/cgi-bin/builders/searchdb.cgi?uid=default&view_records=1&keyword=States and some godd dealers
http://www.mandolincafe.com/links.html#dealers
also, hang around at
http://www.mandolincafe.com. There are a great deal of hobbyist luthiers that wouldn't mind building you a very high quality instrument for a decent price if you're thinking of spending somewhere in the neighborhood of $1000-$1500.
other links you might find helpful...
http://home.hccnet.nl/h.speek/bouzouki/
http://www.wisdomofthewood.com