Yeah, we had a 7-seater people carrier a few years ago (there are 5 in our family) - a
Nissan Serena - it was a manual too (I'm the opposite to you - I've never seen an automatic one here!). In general, they are a bit smaller than US ones (the Serena is not as wide as you would expect), but still seat more people than standard cars.
I've generally found that you can get used cars cheaper in the UK than in the US. We got our Nissan Sunny for £1,000 (1995, with only 30,000 miles on the clock at the time) and Nissan Micra for £800 (1996, with 80,000 on the clock at the time), whereas when I was in the US earlier this year, everyone was advertising their used cars for between $3,000 and $5,000 and they were usually much older than 1995 and had at least 100,000 miles on the clock!