Here is a pretty nice Under Armour deal. You can get this UA Sportstyle Core V-Neck for $18 (was $30). They have it in different colors too.
Product Details:
- Fitted: Next-to-skin without the squeeze.
Insanely soft & stretchy cotton fabric for ultimate comfort
Material wicks sweat & dries really fast
2-tone heathered texture
Side-split hem
Cotton/Polyester
Imported