There isn't an official place to purchase De Pere gear (unless you get it from the local high schools). But if you're looking for some simple De Pere t-shirts and such, I've found a few providers.

• The CVS on Main Ave at 8th St sells "De Pere, Wisconsin" shirts and hats.
• This De Pere, Wisconsin t-shirt from Axis T-shirts on eBay.
• This De Pere, Wisconsin t-shirt (and others like it) from Amazon.
• These De Pere t-shirts from Hometown Apparel.

If you know of other sources that I should add to this list, please let me know.