You can get a reasonably priced digital scale, at any big box store. Wal mart, Target, Sams, Costco, whatever, for under $50.
The thing is, get on it, at the same time, under the same criteria. Get off, and let it go.
The scale defines your bodies relationship, with gravity. Nothing more, nothing less.
A scale is a tool. But it is not the end all be all, in our journey.
Are you healthier? Are you making better food choices? Are you more active? Have your clothing sizes changed? Have you gotten to a point that you can ditch some meds? Can you now walk 2 miles without thinking you are going to faint, when before, a block was a struggle?
I bought my digital scale at Wal-Mart. I've had it for 6 years. It's cool, and pretty, clear glass, digital display.
I step on each morning, same criteria. Naked, went to the restroom.
It varies, depending on, what I ate, did I lift? Lifting, always gives me next day gain, due to water retention, for muscle repair. Food, makes difference. Processed crap, WOW!
I would worry less about an accurate scale, and pay more attention to tracking, and learning, how what you do affects the number. It's data! Nothing more, nothing less.
At the same time, if you get into lifting, your weight might not change, but your size and shape will!
Love me some weight lifting!