Asset Management software?

I’m looking for asset management software the polls domains for networked hardware (that doesn’t cost a fortune). We have under 1,000 devices, and do not currently have an asset management procedure in place, which we need for obvious reasons. What does everyone else use for this purpose, and how much did you pay for it initially, and what maintenance costs have you incurred over the time you’ve used it? I am doing research on my own, but it’s always good to hear from those actually using the software. Any information will be appreciated. Thank you.