- the difference may be due to dates. I have just shopped for a Compact Manual (Ford Focus or similar) manual/stick shift for 10 to 15 February- Kendal, Penrith and my local branch in West Cumbria (which I can walk to in fifteen minutes) all come out at the same price of £247.80.
If you contact them they should pick you up at Oxenholme- others here have done that with success.
Otherwise the best route is by taxi from outside the London bound platform, the cheapest is on the bus every half hour #41 or 41A from outside the station. That changes number to 43 or 43A at Kendal Bus Station (but stay on) and stops right outside (£4.50 each). Oddly the pretty infrequent #106 from Penrith also stops right outside.
It's less than 3 miles so it shouldn't be more than £10 for the taxi. If there isn't a taxi waiting there is a list of numbers to call at the taxi rank and I'm pretty sure there is also a rate card there for such standard journeys as this. The on duty company varies by time of day and day of week- yes Kendal is that type of town.