You may not be able to find an exact match to Dante's boots. They're a very unique style. Unless you can access someone willing to make the shoes from scratch, your only other possible option is ebay.
In terms of a regular boot equivalent, try any similarly colored work boot. Steel tips aren't required. If you're looking for a more stylish boot, try hot topic's website. They carry boots that may suit the look for Dante. While the hot topic boots may look pretty cool, they aren't as rugged in the end as work boots. But they can last for a few years if taken care of properly and worn mostly at cons or cosplay events, rather than everyday wear. Work boots will serve better if you actively wear your cosplay outside of cons and events.
Don't meddle in the affairs of dragons, for they think you are crunchy and good with ketchup.
Current Cosplay Project:
Nero- Devil May Cry 4.
Current Costume status: Wig ordered.
Current Prop status:
Deathbringer: Full scale mock-up 85% complete. Design adjustments in progress.
Red Queen: Design in progress
Blue Rose: Not started yet.