What do I need/cost?

[RammingSpeed]

Really? I typed in gearmotor on eBay and it came up with motors about £70 a pop! Are they bigger ones?

[haz]

well you would.
http://www.ebay.co.uk/itm/6V-300RPM-Torque-Gear-Box-Motor-New-/220767144125?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3366bf48bd
the norm in most ants.

[RammingSpeed]

Thanks much, bookmarked it.

[Vertigo]

Right, I for one am going to disagree with both of you :P

http://www.ebay.co.uk/itm/6V-300RPM-Torque-Gear-Box-Motor-New-/220767144125?pt=UK_BOI_Industrial_Automation_Control_ET&hash=item3366bf48bd

I've tried these motors, and, they're "alright", but don't have as much torque as the not-so-cheapo versions. These are probably alright for a spinner, but for something that really needs the torque, especially pushers, I wouldn't reccommend them.

I would advise the following:

2x http://www.robotbits.co.uk/motors-gearboxes/50-1-high-power-micro-motor-gearbox/prod_10.html
2x http://www.robotbits.co.uk/motors-gearboxes/micro-motor-bracket/prod_11.html
2x http://www.robotbits.co.uk/wheels-casters/32x7-mm-wheel-white/prod_13.html

http://www.micronradiocontrol.co.uk/lipo_hyperion.html (I'd probably go for 240mAh 2 Cell)
http://www.robotmarketplace.com/products/0-CELECTRA.html (Easy and effective, exactly what we use)

http://www.robotmarketplace.com/products/0-SABER2X5-RC.html

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=11965
http://www.ebay.co.uk/itm/Spektrum-Controller-Blade-Helis-MLP4DSM-EFLH1064-/370516976012?pt=UK_ToysGames_RadioControlled_JN&hash=item564488618c#ht_2026wt_1139

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9682
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=9683

http://www.directplasticsonline.co.uk/HDPESheet/Black/2mm/

[RammingSpeed]

Lifesaver.

[Vertigo]

Lifesaver.

I know :P

[haz]

god you get smugger every day

[RammingSpeed]

Would 4wd be a bit overkill?

[Gropaga]

Would 4wd be a bit overkill?

I think not because Vertigo made 4wd antweight robot.

[Vertigo]

Would 4wd be a bit overkill?

Absolutely not, and the sabretooth can easily handle it.