Will i be using nursing pads for as long as i'm...

Will i be using nursing pads for as long as i'm bfing? (Like does it eventually become so that you don't leak whenever, only when bubs is on?) At the moment i've only used disposables but it's so costly. Do material pads work just as well? Do you need to change them more often? Is there a particular material that's 'best'? Can anyone recommend where to get them or even a seller on ebay? Sorry for all the questions; I never really looked into it as I wasn't sure if i'd be successful this time around but i'm heading into 3 months (yay!) so i'm pretty sure we'll continue for as long as possible. Another question; my let down can be quite painful (ranging from just a tingling feeling to a full on burning sensation), the first tends to be felt the most (esp when super full) and reduces with each susequent letdown during the feed. Has anyone else experienced this and did it lessen as the months went by? Also is mastitis the only reason not to wear normal underwire bras? I'm not talking all the time (wouldn't be convenient anyway) but every so often? Like if DP and i went out to dinner and i wanted to wear something a little more um uplifting lol would it be ok? I hate how unflattering to your shape maternity bras can be but also they don't suit a lot of my nicer dresses. TIA :)