PDA for Moving Map

I know it sounds unlikely for someone seeking to put a yoke mount moving
map in his 150 to be seeking advice from a soaring group, but here I am...

I have a whole lot of sales resistance to the Garmin 626's or whatever
of this world, that go for prices in four places of digits.
And the current run of aviation GPSs all seem high...

But then, I searched on moving map displays and Bingo! plenty of better
priced hits. I was specially interested to read that sailplane
enthusiasts have been using PDAs with aviation apps loaded for a while
now. I read about Anywhere Map, and one or two others.
My interest is the one finger selection of a destination airfield
with distance to go, cross track error, and heading and bearing to steer.

Any useful tips??

Thanks in advance
Brian W