DC-DC Step-Down Converter Alternate Source?

Hi all.
I'm looking for a LM2576 (preferably HV) DC-DC step-down board. I can find them all day long on Amazon and eBay, but I'm looking for an alternate source. Has anyone found them from somewhere else? Or maybe a similar board somewhere else? It doesn't need to be LM2576HV-ADJ based, but that works well for my application.

Requirements:

16-24v DC input
14-15v DC output
1.5A MAX output (likely less)

I'll post any findings or solutions I find. Thanks!

ps- for reference:

Have you looked at Pololu.com? Check the Regulators link on the left hand menu.

Excellent, thank you!

I also found a few on robotshop.com