You can have your controller wallet (wallet with the coins in it) on your home pc/laptop/pi. This can be 1 or as many as your processor will allow, on the VPS it is different, you can only have 1 masternode per IP address.

So depending on how many different masternode coins you have I recommend putting as many different masternodes on 1 VPS as long as they are different coins. Consolidate your nodes on VPS, don't pay $5-$10 per masternode on VPS and leave additional RAM space on your servers, get as much bang for your buck as you can.

Given the current state of masternode coins you really need to be frugal with your VPS setup, there are alot of good providers out there that are cheap, run a google search and find what is best in your country, $5/month for around 1k mb of memory is standard, some services let you go lower than that.

Good luck