There are several lower cost GPS computers available if you're not sure yet about the features you'd like and use most: Bryton, Lezyne, XOSS and a few others all make functional GPS bike computers. Some are easier than others to use, others have more features. I got a XOSS G+ in January (two, actually, after trying the first), which works fine for me, although XOSS customer support vanished during the pandemic. Mine works fine with my sensors (heart, cadence, speed) so I haven't needed any customer support.
Check Amazon for user reviews. Right now for under $100, Bryton and Lezyne are best buys.
When we approach the $200+ level, might as well go with Garmin or Wahoo.