Simple answer:
Calculate the cost of gas @ $2.20
You can value your time how you like
let's say you get 30 mpg, you are looking at a cost of 10.25 or so for gas for the trip.
You could also consider the cost of vehicle maintenance/wear and tear, let's call that $3 for that trip.
you are looking at around $14 on top of their list price + 2 hours of time. I personally would value my time at $50 + when not working, so that would be like an extra $114 to make the trip. You can value your time how you like, but I would say it's worth it to just order online. Maybe call and see if they will budge on the price a bit.