I've found that Plaza Extra has the best selection and prices for beer, wine, and liquor. They also have the best selection for overall provisioning. I head there first, then on the return trip to CYOA I make a quick stop (as needed) at The Fruit Bowl, then Pueblo, then Moe's.

I typically provision for a 2 week trip with 6-8 persons with all but a couple lunches and dinners onboard. It takes me ~3 hours roundtrip from CYOA to complete the provisioning and unloading.

Bring some heavier duty shopping bags. I think CYOA also has heavy duty bags available. Moe's supplies free plastic bags. Pueblo and Fruit Bowl has them for a small fee.

I rent a minvan from Avis at the airport then return it at the Seaplane base the next day. After provisioning I take my crew in a sightseeing ride to Mountain Top and Drake's overlook. Rental and fuel runs ~$110.