I'm assuming you're talking about an upper-end travel team of young men (i.e., relatively expensive stuff in men's sizes), as opposed to a low-end kid's rec. team??
Are you talking about just a typical "uniform package", i.e., 2 jerseys, 1 home, 1 away - 1 pair of socks and shorts (sometimes they throw in a ball with this, too), where the kid supplies the extras....or are you talking about supplying just about everything....uniform package, plus 1 pair extra socks, windsuit, bag, goalie gloves, wrist guards, etc., where the only thing the kid supplies is his jock and cup, shoes, and special undershirt (compression or sweat absorbing)...
golfmom....the typical "uniform package" is $150.00, multiplied by 15-16 players on a typical team = your ballpark figure...
Note that these costs go higher for high school and more specialized leagues because of the custom jerseys...also, the shoes can get quite expensive if they are supplied...