Recommendation for Inexpensive Filter App

[hsat]

Hi, I'm looking for a filter app for my store that doesn't cost too much. I only need very basic filters. It's a clothing store but I just need filters for size, type and brand. Due to the nature of what I sell i'm not too worried about having other options like colour etc. I was using instant search + but didn't realise their 'free' version only allowed 50 searches. On top of this, all my newly listed products do not show up on my website and support haven't really been able to figure out why. 

Any ideas please? 

Many Thanks