Ditto the Stampin' Up rec. Thats the only reputable online store/provider I can think of right now... its a shame Archiver's doesn't have a 'shop online' option. They are the best!
I make my own cards and use Stampin Up stamps. Usually they're sold through demonstrators but you can now purchase them directly from their website. They're really nice and very cute!
I love Stampin Up stamps (but I'm a demo so I'm biased). You can by online, but they will give you the option to order through a demo website to get the stamps cheaper. But, that doesn't mean you have to have any more contact with the demo than you would through the website. Just pick a random demo from their list to save the cash.
There's a vendor on Etsy who makes custom stamps for cheap. I think the name is terbear or something like that. I thought he did an awesome job on my wedding stamps. GL
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Re: Rubber stamps
try ebay.
i just sold a ton of rubber stamps on there.
Stampin' Up! stamps are a good brand and have nice sets. they are sold via parties (like tupperware)
The O'Baby Blog