250 ohm amp

hi i need to buy a 250 ohm amp, please can you list the cheapest amp you know that will power atleast 250 ohms help is very appreciated, i need the amp to power my beredynamic dt 990 pro

You should check out a portable amp designed by Cmoy. There's lots of makers out there that use Cmoy's template and make there own versions. I got mine by Lucid Labs at Amazon which has interchangeable Op Amp, and it can power up to 300ohms headphones. There's also one by JDS Labs which packs more features. You can even contact some makers to customize the amp for your needs, and, or for your specific headphone which is what JDS Labs do here.

I'd also like to add that this looks freaking cool, like almost steampunk-ish, and doubles as a geek fashion statement. It's an eye turner for sure.