My first stop would be the bank. Pull out a whole bunch of money, at least two grand to start. Put that money in your paypal account, mark it "For Jango Fett Replica costume". My next stop is to start reading all the build threads here, most people will list where they got parts for it. There are some reputable sites like "bobamaker" that you can get some items. (I got a great leather vest there). Keep watching the classifieds on this site, sometimes someone will be selling an item or two you need. Jango requires a lot of time, money and patience. My costume is done, and yet... it's just begun! (already looking at upgrading helmet, jumpsuit, holsters, westars... everyone here knows what I mean.)
More like $4 grand. I used a spreadsheet to keep track of each item, what I paid, who I bought it from, and when it came in.
Here is an example minus the "who"
HELMET: BKBT Cold Cast $265 Paypal- 1/9/2013 Arrived
FLIGHTSUIT: 717 color $150 Paypal- 10/13/2012 Arrived
FLACKVEST: & Gauntlets $700 Arrived
GLOVES: Navy Blue $45 Arrived
CHEST AMOR: Bulk Order-1 $823 Paypal- 10/9/2012 Arrived
BACK ARMOR: Bulk Order-1 Arrived
SHOULDER BELLS: Cruzer CC Cruzer Bulk Order-1 Arrived
COD: Cruzer CC Cruzer Bulk Order-1 Arrived
THIGH ARMOR: Cruzer CC Cruzer Bulk Order-1 Arrived
SHIN ARMOR: Cruzer CC Cruzer Bulk Order-1 Arrived
BOOT ARMOR: Cruzer CC Cruzer Bulk Order-1 Arrived
HOLSTERS: Cruzer Cruzer Bulk Order-1 Arrived
AMMO BELT: SEEKER Bulk-2 Arrived
GIRTH BELT: Made it $150 Arrived
BOOTS: Repro Crow62 $250.00 Arrived
MOW JET PACK: Ebay $300 Arrived
WESTAR PISTOLS: Ebay $753 Arrived
Knee Armor: Bulk -2 $348 Arrived
JET PACK HARNESS: Seeker $115 Arrived
Beacon Light
S $97.72 Arrived
Aluminum collar
S Arrived
RF Servo & Light: $110 Arrived
Knee Armor Upgrade: CC $230
Total: $4336.72
Of course you can probably find people who have extra parts so you might get them cheaper.