For a contemporary sporran Stillwater is probably going to be the only one.

There was a thread a couple of weeks ago about a sporran made by a Renn Faire supplier which got good reviews and I think it was under $40.

I've got two Buzz kidder Rob Roy sporrans (Brown and Black $50) and I think they are great, versatile starter sporrans. They have the magnet and I have had no issues with it. It's not so strong a magnet that you notice but it holds the flap down well.

I've considered modifying them a bit (spruce up the clasp, swap out the tassels...) but just haven't had time to play with it.