I depends what you want to use it for.
As an example I use a Behringer BLE100 bass limiter/enhancer and since I got my first one (which was £20 new) I am no longer seeking my perfect compressor. For a long time I thought I wanted a compressor to even out my volume, and tried every one I could get my hands on and even bought a few, but all along it turns out that this cheap little limiter pedal is exactly the right tool for the job I need it to do, ie to even out my fingerstyle playing so I can play with a light touch and let the amp do all the hard work without getting massive peaks in the sound when I do hit a bit harder.
I now have two BLE100s as I scored a spare one on ebay a few days ago for £9 including delivery. I think the original owner may have been disappointed that he couldn't hear what it was doing, but the transparency is one the main things I like about it - it doesn't make the bass sound 'squashed' like some compressors do.