Not sure on the cheapest place to buy them from.
Pins.. It really depends on how long they've had to get snug, how gentle you are when you are T**ting (tapping) them out. I tend to find that gentle blasts using a punch does the trick. I, fortuantly got them out with no bending but bought a spare set of pins just incase.
Cracking reviews about the pads though, good choice. Good Luck