How much do you guys typically pay for a VFR transponder check?

For alignment due to intermittent Mode C I paid
C$330.00 - and the problem came back after 6 months - so twice in one year
- doesn't anyone guarantee stuff anymore?
When there is only one guy in the area doing it he's kinda got you.

--
Tony Roberts )
PP-ASEL
VFR-OTT - Night
Cessna 172H