VPS with 80 GB Space, can't download the whole blockchain? I am using an application and WordPress that allows people to pay with Bitcoin in a small multi vendor marketplace for trading hobby items. 

The plugin that I'm using is recommending that I run a full Bitcoin node? I don't think I need to, but how does someone do that with a small SSD? 

Can you prune and simultaneously download? Is there a blockchain light I don't know about. 

I don't want to be running a $60 vps just because of the chain 

Thanks!!
Yes, pruning will reduce disk space needs to a few GB.  The whole block chain will still be downloaded (which may cost you something in bandwidth charges), but old blocks will be discarded as you go.

See How can I run bitcoind in pruning mode?