Hey mate i have coupon codes for both the HR20 and the H03 here is my review of the Skilhunt H03. Both these lights are worth a look at.
I also have a coupon for the HR20 but i am yet to review it. They are both 30USD right now so under your budget. I love the H03 but the HR20 comes in a pack with the battery included and it has a built in USB charger. I will add for every day use go with the skilhunt over any other headlamps. Just because of the headband is leaps ahead in quality. My Nitecore HC30 band is cruddy but its lasted over a year and half now i think but the Skilhunt is better.