Operated by Hawaii Music Supply, this website has an incredibly wide selection of professional ukuleles for sale. In addition, they boast something not all online instrument retailers can: they have a Youtube channel through which you can hear each instrument and get an idea of its timbre and quality. (This link remains as a great resource, even though I am no longer offering ukulele lessons for the time being.)

An excellent resource for beginning ukuleles and string accessories.

Additional Resources

Southwest Strings - another source for sheet music & accessories that periodically offers discounts.

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My personal go-to source for sheet music, books, and instrumental accessories. Sign up for their mailing list to get access to helpful discounts!