Amazon has the Gildan Men's V-Neck T-Shirt 5-Pack (GIL1103) for $12 with free shipping on $25+ or with Prime. Lust price: $15. These tees are built to last with durable tubular collar design and covered shoulder seams. Available in select sizes S to XL.
Has good Amazon Reviews.
eBay has the 3-Pack Hugo Boss Men's Stretch Cotton Boxer Trunk Underwear Black/White/Grey for $13 with free shipping. Features 95% cotton 5% elastane, dynamic stretch cotton.
Kohls has the Nike Men's Full-Zip Fleece Hoodie (several colors) for $28 with free shipping on $75+. Features drawstring hood, fleece lining, zip front, long sleeves, 2-pocket. Available in select sizes from S to XXL.