I recently purchased the garmin alpha with the mini collars.
The dog trace is slightly cheaper. But the garmin is a higher spec.
Sport tek meant to be good and similar price to Garmin.
Careful there are a few dodgy Facebook pages and websites. I was on one website, couldn't believe how cheap they were. It was when they were looking for payment in crypto the alarm bells started to ring. If the deal sounds too good it probably is.