If you're from the UK and want chariot bases, try Veni, vedi, vici
If you're in the US the people who make these are Gale Force 9
UK prices, you get 3 for £6, and they're magnetic to boot. Not sure how the prices match up to the US GW prices, but for over here they're well worth it.
Useful information for some of the more interesting base designs though, nice to know, cheers