Well, they aren't screen accurate, but for a "good enough" Han Solo boot on a budget, I recommend Soviet officer boots. They're tall enough (they come to about 2" below my knee), they're shiny but don't look like vinyl, and they usually go on e-bay for between $40 and $80.
Note: They will look flat on the e-bay auctions, but when you put them on (especially if you wear them for a bit), they'll shape to your calf and will look pretty good. They're leather, too.
Now, they aren't screen accurate, but when screen accuracy costs double and you're on a budget...
I'll try to post pics of myself wearing the costume, and that focus on the boots.
P.S. The costume on Jedi-Academy.com is mine.

It's also not perfectly screen accurate, but I've been upgrading it bit by bit over time.