Where to buy crabs on way to PA (50/301 Eastern Shore) - Friday 23rd & advice?

[Bug Guy]

Hey all,
Sorry, not a fishing report - but I could use a hand. Going to PA on Friday (23rd) for a party Saturday. Wanted to take up some crabs - maybe a bushel. Plan is to throw them in a 100qt marine cooler and cook them in PA. Need advice on:

1) Where to get them Friday morning? Will be driving from Bowie along 50, over the bridge, then up 301 through Delaware. Leaving Friday about 7 am. (4 hour drive total). Willing to drive off the beaten path...but not too far.
2) Your opinion - Cook Friday or Saturday?

Any other advice on taking crabs on a long ride to PA would be appreciated.

Thanks,

Bob