I had the same question in my mind. Also, 20-30 pack of condom cost around 12-15 bucks in sams club or in walmart. and I find pretty nasty using condoms at 2 o'clock midnight. As guy_tensed said, using condoms at the some time before cuming is a good idea. LOL...

Moreover, 20-30 packs last only 10 -12 days..so if we calculate, the condom bill is more expensive than phone bill