here's a parts list for putting together a P-bass from pre-made parts. the costs noted are for reference, and can vary significantly depending on the exact parts chosen. much of the how-to's can be found in other threads here in this forum
* Mighty Mite Maple/Maple Fender style neck - $125
* Fender '62RI lefty P-bass body - $300
http://cgi.ebay.com/LEFTY-Vintage-62-RI ... dZViewItem* Leo Quan BAII bridge - $80
* 4ea Hipshot Ultralight tuners (I'd splurge here) - $90
* Nordstrand NP-4 pickup (I'd splurge here) - $115
* Tortoise/w/b P-bass pickguard - $75
http://cgi.ebay.com/GENUINE-FENDER-LEFT ... dZViewItem* 13ea pickguard screws - $3
* 4ea neck screws - $3
* 2ea 250k ohm a/t pots - $10
* 2ea knobs - $10
* 1/4" mono jack, switchcraft - $3
* .047uf Orange Drop cap - $3
* neck plate - $5
* neck plate pad - $2
* shielding foil - $10
* misc wire and solder - $5
* Hipshot string retainer (another splurge) - $10
http://hipshotproducts.com/cart.php?m=p ... tail&p=235 all totaled, this above average build on a budget (minus case and strings) comes to a total of just under $850. if you were to have someone assemble this for you, the typical going rate is usually around $100 - but could be more if any of the parts were used and required repair.
another upgrade to consider would be to utilize a Fender '62RI CIJ neck. while this would add another $250 to the project cost, the neck would also include all of the correct decals and a serial number - something to consider should you ever decide to sell.
also note that if you decide to utilize a CIJ neck, be certain to also utilize the same RI year CIJ tuners - the standard CIJ tuners have a slightly smaller hole than standard USA/MIM Fenders. cost for these tuners is similar to the Hipshots quoted, but they will be a little heavier
all the best,
R