Perhaps a new menu could be added, with a random option on certain groups of items.
(Random Items)
$2,500 (1) Primary Weapon
$1,000 (2) Secondary Weapon
$1,000 (3) Melee Weapon
$2,250 (4) Move Speed
$2,250 (5) HP / Armor
$1,000 (6) Grenades 1
$1,000 (7) Grenades 2
Each time you spawn, you'd get a random item from each of the sets.
The total there does add up to $11,000, so you could choose all random set.
The cost may need work, as I made them up on the spot.