To be honest I think it was reasonable but actually we never heard ahead of time (I assume you can email or call) and we just authorized the extra charges on arrival.
If you order from we-go-shop... Marge will get whatever you want. On our trip, we asked her to pick up a few bottles of wine for us. The only caveat is that you must be there to accept delivery and whoever is there must be age 21 or older. Our daughter was arriving a day prior to us... but she was 22. Marge just wanted to be sure that she was not delivering any alcohol to minors.
Since gardengrocer.com doesn't have any info online (just took a quick look), I would just give them a quick call if you wanted something other than the usual Miller and Bud products. I want to say I remember someone stating that garden grocer went out of their way to get some hard to find items--which is a big bonus, but I wouldn't be surprised if there was a premium for that.