While I was at school, there was a small local pro lab where I dev 135 and 120 c-41 at good price ($4-5/roll)

I started to look at local pro labs and found that the price is pretty high for 135 processing.
Do you always process at pro lab? is it really that bad to process at local walgreens/walmart/etc?

i know i am stuck with pro lab for 120s.. and the price isn't bad at all.
but i dont feel like paying $8+ for 35mm rolls.