Cheaper using a push pump to fill pcp's???

[angrybear]

It is all down to the size of the tank you want to fill.
For my Huntsman Classic: 70-80 pumps from my BSA/Hill mk3 for 114cc tank. Give or take 1 pump per shot. Very happy with that

That depends what you're filling from & what to , on my AA510 it was 3 pumps per 2 shots, after first getting the pump up to pressure.

For the OP yes a pump is a bit cheaper & provided the air is dry it's fine but a cylinder is so much easier.

As for those Chinese compressors, by the time tax, shipping & import duty is paid the cost would cover filling a cylinder for best part of 10 years, & I doubt the compressor will last that long.