I've heard some people say that all you need is a bike in order to commute. But, to make it a routine thing I say you need much more. For people like me who commute 10-20mi one way I've had to buy things as necessary. The prices are what I assume are low-end. Correct me if I'm wrong.
Bike: a good road bike so you're commute doesn't take too long - $800
Seat Pack: $20
Patch kit + tube: $20
Clothes (1 set): $100
Winter Gloves: $30
Headlights (250lumen x2) : $220
Blinkies (x3): $75
These are the items I can't do without. I've tried substituting (like clothes) but for longer rides cycling specific gear is a must.
Anything to add or correct me on? And let's just say the other few commuters I've seen seem to have spent way more than what I've listed.