I know you said they're 'boring', but a limited time run of Stack Overflow t-shirts/coffee mugs for sale would be really great; limit of one or two per purchase would be fine - you could have the classic Stack Overflow design or add some fancy "10 year anniversary" prose to the design for a limited run.
In the past I recall a Community Manager has said, when these used to be available, that the company ran delivery and packaging out of their office. Today you are much bigger (and wiser) and there are no doubt countless local shops/services in New York that handle t-shirt or mug creation, packaging, and delivery... even internationally (I wouldn't mind paying $30 plus shipping for a plain black Stack Overflow/SO Anniversary t-shirt, personally).