National Express has just released a new batch of UK coach seats priced from $3 (£2), each way. Taking the train on some of these routes regularly costs over $80.
The fares are valid for travel until January 6, 2013, on more than 100 routes across the UK, but availability is limited so early booking is advised.
Here's a sample of what's on offer (prices are each way):
You may have to be flexible with your dates to find the best fares. A $2 (£1) booking fee applies for each transaction.