My prices are generally low as I am not a professional, however my prices are based on the complexity of the request. My general prices:
Posters: $15-$30
Logos: $10-$25
Banners (for print): $20-$35
Website Banners: $10-$20
T-shirts (one side): $15-$25
T-shirts (two sides): $20-$30
I also can design jewelry, sets, and other products. This prices varies the most, so it is hard to estimate.