250w hps ballast from bulbs.com= $72.99
250w hps lamp from bulbs.com= $8.99
15' 14/2 soow cord from local supply house= $10.00
mogul socket from bulbs.com= $8.29
2'x2' 22 gauge sheetmetal from home depot= $10.00
(50) 3/8'' self tapping screws from h.d. = $4.00
(5) 3/8'' so connecters from h.d.= $3.00
1000 cubic inch metal j box w/ cover from h.d.= $25.00
(1) 15a 120v grounded socket from h.d.= $5.00
total= $147.27 + shipping from bulbs.com
hope you are handy cuz you gotta build your own hood out of the sheetmetal and your own cord. if you are not familiar with wiring and electrical work i wouldn't even attempt it...............
idk what you can get a complete set up for but i doubt your buddys "fraction" is larger than 1/2 of what a ready to go system can be found for.
p.s. a 400w lamp and ballast is like $10 more from bulbs.com i would go with that iffn i was to build one