It used to be cheap enough, back in the day.
APUG BLIND PRINT EXCHANGE
"Wubba, wubba, wubba. Bing, bang, bong. Yuck, yuck, yuck and a fiddle-dee-dee." - The Yeti
It's STILL cheaper than film processing.
One 10 pack of fuji FP-100c = $9.95 USD / 10 = $0.99 per exposure.
One roll of reala 100 = 4.95. + 10.00 processing = 14.95 + $8.00 contact sheet = $22.00 (on 6x7 that's $2.20 per exposure or $1.37 on 6 x 3.45, and you don't have a print yet!)