really small (and cheap) amp

Hi!

I want to install my rio in my vw golf III and need an amp for this.
As a start I want to use the speakers that were built in by vw (2 in the front) and need a small amp to mount under the seat.
My problem is, that i cannot find a small and cheap amp for this (two channels with 75W would be enough) which can handle 4V inputs... All amps i found that were really small and cheap (about 45$) could only handle 2V inputs...

Does anyone have an idea?
By the way, I live in Germany ...

Greetings,
Morten

i assume this becuawse we have 4v preouts going to 2v setting amps, and they have been running for over a year now, just turn the input gain down on the amp assuming it has that, and you should be fine with the cheaper amp

The 4v/2v thing is a FAQ entry.