They have these things now called trains, pretty good really, they travel around to most places, and can be quite cheap, especially if you book in advance.
There's also something called a coach, not the old thing pulled by horses, this uses an engine.
Seriously, I've travelled all over trading basses and stuff, treat it as a day out. If you're doing a trade, then meet halfway somewhere nice.
And ask at your local train station, sometimes it's cheaper to stop off halfway, and catch another train, rather than go all the way direct. For example, it's cheaper for me to travel from Birmingham to Cheltenham, and then on to Bristol, than it is to travel direct to Bristol, and only takes 30 minutes longer, but saves about £20.