How much would it cost to make a roughly 18" drive consisting on 4 motors and 4 omni wheels? I am wondering this because I may order some parts to mess around with since I may have to make a team by myself next year.
I’d wait until we see the game for next year. Maybe a standard drive won’t be optimal for the game(for once).
If you look on vex.com the prices look like this:
4 motors: 14.99x4= 59.96
4 4" omni wheels: 24.99(2-pack)x2 = 99.96
10 bearing flats: 4.99
Rubber shaft collars: 5.99
4 pack 12" shafts: 8.96
1x2x1x35 steel c-channels 4-pack: 8.99
2x2x35 angle 4-pack: 17.99
Total: 206.84 excludes shipping fees.
If you’re adding motors, then you’re probably going to want a cortex and all the assorted equipment that goes along with that.
(Just an addition, 4 4" omni wheels cost $49.98 , but the smaller omni wheels are cheaper.)
lol. Whoops 
Cheapest way is to go on the derp web and bargin
“Vex Forums”