Well im jailed...so i guess i can make some ideas up.
How about a UFO? Itll cost $20k...why? Because when you drive it,it reflects bullets back like brella.

Nunchucks-Make it 8 damage and very quick/plus knockback.

Ninja stars-Like throwing knives but these go a bit spiral instead of straight. Damage 6 but can keep going until it hits something else.

Sticky bombs-15 damage(can stick one at a time)/good accuracy/knockback

Machete-10 damage/fast/around $30k.

(Last idea)Flower-Like the ones on clowns shirts. A flower will spray water. Doing 7 damage and has new ability like poison but itll be called "soaked". Youll just be slown down and not hurt