I was the same about cigarettes years ago. At a certain point, it became too expensive for a habit. So I quit.

feels nice to spoil yourself and get out and mini-socialize... 
but yeah I remember thinking it was getting expensive for drip coffee at $2.15 then $2.45.... moved real fast.

Why would I spend $7-9 on a single cup of coffee a day when I can get a can of it at Costco for $15 and it lasts me 2-3 weeks of two thermoses a day plus a big cup with my breakfast before leaving the house? Do the math...